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T h e F i r s t N a m e i n A i r D i f f u s i o n

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table of contents

Product Description ...........................................................................................................................C-3

Dimensional Data......................................................................................................................C-4 – C-6

Typical Control Sequences ..........................................................................................................C-7 – C-8

Sound Data.............................................................................................................................C-9 – C14

Features at a Glance .......................................................................................................................C-15

Typical Specifications .............................................................................................................C-16 – C-17

model DUDual Duct

product descriptionD

ual D

uct A

ir Term

inals

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C-3

APPLICATION• Dual duct systems utilizing energy conserving fan controls with

variable air volume (VAV) temperature control loops

• Hot and cold air flow rates are delivered to meet space loads,while maintaining desired total air flow rates to the space

• Pressure independent operation for precise air volume controlof both hot and cold air flow

• Configurable for both mixing and non-mixing applications withvariable or constant total flow to the space

• Maintain space temperature while maintaining air changerates or space pressurization, or meeting minimum ventilationrates.

• Control strategies using pneumatic, analog, or direct digitalcontrol (DDC) systems to satisfy any application

FEATURES• Integral attenuator on Models DU1, DU1R, & DU-2

• Compact Assembly with Models DU-3 & DU-4 (non-mixingapplications)

• Flow sensor arrangements available in the inlets of the airterminal, and a flow totalizing sensor at the discharge, basedon control strategy.

• Control sequence may be inlet sensing only (I sequences) orcombination inlet total (I-T) sensing (one inlet sensor/one totalsensor). Available with a variety of control sequences formixing and non-mixing application.

• Hot & cold round inlet sizes from 5" to 16" diameter – can bedifferent sizes on the air terminal

• Right or left hand hot inlet location

• Flanged or Slip & Drive Discharge Duct Connections

• 22 gauge steel, leak resistant casing lined with 1/2"thermal/acoustical insulation (NFPA 90A & UL181)

• Balancing taps / calibration chart included for fieldadjustment.

OPTIONS• Steel control enclosure

• Bottom access door (Patch plate, Double cam-lock, Hinged)

• Model DU1R includes factory mounted 1, 2, or 4 row hotwater coil

• Electric duct heater (installed downstream of the terminaldischarge)

• 1" thick glass fiber insulation, 1/2" or 1" foil-faced insulation(taped edges), 3/8" closed cell “fiber-less” insulation, Fiber-Loksystem using 1" high density foil-faced lining with steelencapsuled cut edges (approved by the stringent CaliforniaOffice of Safety, Health, and Planning Department (OSHPD),see page A-11.

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model DU1Dual Duct Attenuator - Flanged

model DU2Dual Duct Attenuator - Slip & Drive

dimensional data

5 TYP.

TOTAL SENSORL.H. DIA.

R.H. DIA.

INLET SENSORS

2 TYP.

LEFT HANDDUCT

RIGHT HANDDUCT

47

45-5/8

6

OPTIONAL ACCESS DOOR

B

OPTIONAL CONTROL

ENCLOSURES

A 7TYP.

11-1/4

H

W

5 TYP.

L.H. DIA.

R.H. DIA.

INLET SENSORS

2 TYP.

476

H

W

LEFT HANDDUCT

RIGHT HANDDUCT

TOTAL SENSOR

OPTIONAL CONTROL

ENCLOSURES


45-5/8

7TYP.

11-1/4

VELOCITYWING

MODEL DU1BOX MAX. SIZE INLET DIA W H A B A 6 22 10 8 20 40 B 8 22 10 8 20 45 C 10 26 12 10 24 60 D 12 30 14 12 28 75 E 14 34 16 14 32 85 F 16 38 18 16 36 100

DISCHARGE DUCT

MODEL DU2BOX MAX.SIZE INLET DIA W H A 6 22 10 40 B 8 22 10 45 C 10 26 12 60 D 12 30 14 75 E 14 34 16 85 F 16 38 18 100

DISCHARGE DUCT

VELOCITYWING

APPROX.WT., LBS.

APPROX.WT., LBS.

model DU1RDual Duct Attenuator & Hot Water Heat

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dimensional data

47

L.H. DIA.

RIGHT HAND DUCT

2 TYP.

R.H. DIA.

LEFT HAND DUCT

H

ACCESS DOOR (OPT) W

5 TYP.

HOT WATERCOIL

HOT WATERCOIL (R.H.CONN SHOWN)

6

CONTROL ENCLOSURESBOTH SIDES (OPT)

A

B

1 ROW: 6-1/22 ROW: 7-9/16

INLET SENSORS

VELOCITYWING

BOXSIZE

MODEL DU1R

MAX. INLETDIA W H A B

BOX DISCHARGE DUCT COIL CONN. (OD)

A 6 22 10 10 10 1/2 1/2B 8 22 10 12 10 1/2 1/2C 10 26 12 14 12-1/2 1/2 1/2D 12 30 14 16 15 7/8 1/2E 14 34 16 20 17-1/2 7/8 7/8F 16 38 18 24 17-1/2 7/8 7/8

1 ROW 2 ROW

• Control sequences for inlet sensing (I sequences) only.

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model DU3Dual Duct Non-Mixing - Flanged

dimensional data

• Models DU-3 & DU-4 are not available with hotwater coils.

• Control sequences for inlet sensing (I sequences) only.

• DU-3 & DU-4 has radiated noise shroud only.

5 TYP.

L.H. DIA.

R.H. DIA.

INLET SENSORS

2 TYP.

6

H

BW

20

LEFT HANDDUCT

RIGHT HANDDUCT


OPTIONAL CONTROL

ENCLOSURES

11-1/4

11-1/4

A 7TYP.

MODEL DU3 & DU4BOX MAX.SIZE INLET DIA W H A B A 6 22 10 8 20 32 B 8 22 10 8 20 36 C 10 26 12 10 24 48 D 12 30 14 12 28 60 E 14 34 16 14 32 68 F 16 38 18 16 36 80

DISCHARGE DUCT

VELOCITYWING

5 TYP.

L.H. DIA.

R.H. DIA.

INLET SENSORS

2 TYP.

6

H

W

20

LEFT HANDDUCT

RIGHT HANDDUCT


OPTIONAL CONTROL

ENCLOSURES

11-1/4

11-1/4

7TYP.

VELOCITYWING

model DU4Dual Duct Non-Mixing - Slip & Drive

APPROX.WT., LBS.

model DUDual Duct

typical control sequencesD

ual D

uct A

ir Term

inals

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C-7

I-T3 SEQUENCE• Dual Maximum Variable Total Air

Flow With Mixing At Minimum Flow

I-T2 SEQUENCE• Variable Total Air Flow With Mixing

At Minimum Flow

I-T1 SEQUENCE• Constant Total Air Flow

All I-T sequences are available with any combination of normally open or closed primary dampers (pneumatic) for use with direct orreverse action thermostats.

I-T MIXING SEQUENCES

• COMBINATION INLET & TOTAL (I-T) AIR FLOW SENSING• VAV HOT & COLD PRIMARY AIR• PRESSURE INDEPENDENT

Model DU, I-T Air Flow Control Sequences control both flow and temperature of the supply air to the conditioned space. Air flowcontrol is maintained by two pressure independent velocity controllers, each responsible for the control of cold and hot air flow,respectively. The air flow sensors, one each for the “cold controller” and the “hot controller”, are arranged in series. One of the flowsensors is located in either the cold or hot supply inlet of the air terminal, and the other sensor is located at the discharge end of theair terminal. The total sensor at the discharge measures the combined hot and cold or total flow to the space. This arrangement isideal for mixing of hot and cold flow while maintaining a constant flow rate from the air terminal to the space. Variable dischargetemperatures are obtained by hot and cold mixture ratios.

HOT DAMPER ACTUATOR

HOT CONTROLLER

LEFTHANDINLET

RIGHTHANDINLET

COLD

HOT

TOTAL FLOW

COLD INLETSENSOR

COLD DAMPER ACTUATOR

COLD CONTROLLER

TOTAL FLOW SENSOR

DISCHARGE DUCT(BY OTHERS)

HOT DUCTCOLD DUCT

MIXING

HE

ATIN

G

CO

OLIN

G

100

% F

LOW

RAT

E

COOL SPACE TEMP WARM

HOT DUCTCOLD DUCT

MIXINGHEATING

COOLING

100

% F

LOW

RAT

E


HOT DUCTCOLD DUCT

MIXINGHEATING

COOLING

100

% F

LOW

RAT

E


Figure 1: Example of Normally Closed Cold Damper with Inlet Sensor & Normally Open Hot Damper with Total Sensor

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model DUDual Duct

typical control sequences

All I sequences are available with any combination of normally open or closed primary dampers (pneumatic) for use with direct orreverse action thermostats.

I-2 SEQUENCE• Dual Maximum & Dual Minimum Flow

- No Mixing - N.C. Cold/N.O. Hot

I-1A• Dual Maximum Flow With Zero

Minimum, & Adj. Mixing Overlap

I-1 SEQUENCE• Dual Maximum Flow With Zero

Minimum - No Mixing

I SEQUENCES

• INLET (I) AIR FLOW SENSING• VAV HOT & COLD PRIMARY AIR• PRESSURE INDEPENDENT

Model DU, I Sequences control both flow and temperature of the supply air to the conditioned space. Air flow control is maintained bytwo pressure independent velocity controllers, each responsible for the control of cold and hot air flow, respectively. The air flowsensors, one each for the “cold controller” and the “hot controller”, are arranged in parallel. One of the flow sensors is located in thecold supply inlet of the air terminal, and the other sensor is located in the hot supply inlet. Although inlet sensing sequences typicallyprovide no mixing of hot and cold air, variations of mixing may be achieved with pneumatic controllers by varying their reset range &start point. I sequences are often used with Direct Digital Controls.

HOT DAMPER ACTUATOR

HOT CONTROLLER

LEFTHANDINLET

RIGHTHANDINLET

COLD

HOT

TOTAL FLOW

COLD DAMPER ACTUATOR

COLD CONTROLLER

DISCHARGE DUCT(BY OTHERS)

HOT INLETSENSOR

COLD INLETSENSOR

HOT DUCTCOLD DUCT

HEATING COOLING

100

% F

LOW

RAT

E


HOT DUCTCOLD DUCT

HEATING COOLING

100

% F

LOW

RAT

E


HOT DUCTCOLD DUCT

HEATING COOLING

100

% F

LOW

RAT

E


Figure 2: Example of Normally Closed Cold Damper with Inlet Sensor & Normally Open Hot Damper with Inlet Sensor

model DU1 / DU2Dual Duct Attenuator

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sound data

TABLE 28a: NC VALUES

200 <20 <20 <20 <20 <20 <20 <20 24 200

300 <20 <20 <20 24 <20 <20 <20 26 300

400 <20 <20 23 30 <20 <20 21 29 400

500 <20 20 26 32 <20 <20 27 31 500

300 <20 <20 <20 23 <20 <20 <20 25 300

400 <20 <20 <20 26 <20 <20 <20 27 400

500 <20 <20 21 30 <20 <20 22 29 500

700 <20 <20 25 33 <20 20 29 33 700

400 <20 <20 <20 <20 <20 <20 <20 26 400

600 <20 <20 <20 20 <20 <20 21 28 600

800 <20 <20 <20 25 <20 <20 26 32 800

1000 <20 20 24 30 <20 22 30 36 1000

400 <20 <20 <20 20 <20 <20 <20 26 400

600 <20 <20 23 26 <20 <20 21 28 600

800 <20 20 27 31 <20 <20 26 32 800

1000 <20 24 32 34 <20 22 30 36 1000

700 <20 <20 <20 24 <20 <20 20 29 700

900 <20 <20 23 27 <20 <20 22 30 900

1100 <20 20 26 31 <20 <20 25 34 1100

1300 <20 23 30 34 <20 21 28 38 1300

700 <20 <20 <20 24 <20 <20 20 29 700

900 <20 <20 23 27 <20 <20 22 30 900

1100 <20 <20 26 31 <20 <20 25 34 1100

1300 <20 23 30 34 <20 21 28 38 1300

1000 <20 <20 <20 23 <20 <20 23 28 1000

1500 <20 <20 23 27 <20 21 28 33 1500

2000 <20 23 27 33 20 27 32 38 2000

2400 <20 26 31 39 24 30 36 43 2400

1000 <20 <20 <20 23 <20 <20 23 28 1000

1500 <20 <20 23 27 <20 21 28 33 1500

2000 <20 21 27 33 20 27 32 38 2000

2400 <20 26 31 39 24 30 36 43 2400

1500 <20 <20 21 27 <20 <20 30 33 1500

2000 <20 <20 25 30 <20 24 31 38 2000

2500 <20 20 29 34 22 29 35 43 2500

3000 <20 23 31 38 27 33 39 48 3000

1500 <20 <20 21 27 <20 <20 30 33 1500

2000 <20 <20 25 30 <20 24 31 38 2000

2500 <20 20 29 34 22 29 35 43 2500

3000 <20 23 31 38 27 33 39 48 3000

2500 <20 <20 25 31 <20 23 32 38 2500

3000 <20 <20 27 33 21 28 34 42 3000

3500 <20 21 30 37 25 31 37 45 3500

4000 <20 24 32 39 28 34 40 49 4000

E14

F14

F16

Size

C10

D10

D12

E12

A6

B7

B8

C8

Discharge NC

MIN ΔPs .5" ΔPs 1.5" ΔPs 3.0 ΔPsCFM

B8

C8

Radiated NC

.5" ΔPsMIN ΔPs 1.5" ΔPs 3.0 ΔPsSize

E14

F14

F16

CFM

C10

D10

D12

E12

A6

B7

Notes: 1. NC values are calculated based on procedures outlined in ARI standard 885, appendix E

Octave Band2 3 4 5 6 7

Radiated 2 1 0 0 0 0 Environmental EffectAll Sizes 16 18 20 26 31 36 Type II Mineral Fiber

18 19 20 26 31 36 Total dB ReductionDischarge 2 1 0 0 0 0 Environmental EffectSizes 5-7 2 4 10 20 20 14 5 ft., Duct Lining (12x12)(300-700 9 5 2 0 0 0 End Reflectioncfm) 6 10 18 20 21 12 5 ft., 8 in. Flex Duct

5 6 7 8 9 10 Room Effect3 3 3 3 3 3 Sound Power Division27 29 40 51 53 39 Total dB Reduction

Discharge 2 1 0 0 0 0 Environmental EffectSizes 2 3 9 18 17 12 5 ft., Duct Lining (15x15)8-24x16 9 5 2 0 0 0 End Reflection(>700 cfm) 6 10 18 20 21 12 5 ft., 8 in. Flex Duct


Table 2: ARI Standard 885, Appendix E

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sound data

TABLE 29a: DISCHARGE SOUND POWER LEVELS WITH INTEGRAL ATTENUATOR

ΔPs ΔPt 2 3 4 5 6 7 2 3 4 5 6 7 2 3 4 5 6 7 2 3 4 5 6 7

200 0.05 0.11 54 <20 <20 <20 <20 <20 54 47 42 35 <20 <20 57 57 50 42 30 <20 58 60 59 49 36 37 200

300 0.11 0.24 55 48 40 36 30 <20 56 53 45 40 30 <20 62 61 55 46 35 32 63 65 62 51 39 39 300

400 0.2 0.43 56 54 48 42 35 30 58 58 48 45 37 30 66 64 59 50 40 37 67 70 64 54 42 42 400

500 0.32 0.66 60 60 54 48 41 35 61 62 56 49 42 35 68 67 63 54 45 41 70 72 66 57 47 45 500

300 0.05 0.12 51 <20 38 32 <20 <20 52 47 43 36 <20 <20 60 59 55 44 30 27 60 64 61 50 33 36 300

400 0.08 0.21 52 45 41 35 <20 <20 54 51 48 40 30 <20 62 61 57 47 33 30 64 67 63 53 37 38 400

500 0.13 0.33 53 49 45 39 32 27 56 55 52 44 34 29 64 63 59 49 36 31 67 70 65 55 40 39 500

700 0.25 0.64 57 58 54 48 41 34 59 60 59 50 42 37 66 66 63 54 44 39 72 73 68 58 46 42 700

400 0.06 0.13 51 <20 36 32 <20 <20 53 48 43 35 30 <20 56 54 51 42 32 28 57 58 56 48 36 39 400

600 0.13 0.28 53 49 45 41 35 29 55 54 50 44 36 29 61 59 56 47 37 33 63 64 60 51 41 41 600

800 0.23 0.5 57 56 53 49 42 36 58 59 57 50 42 36 64 63 60 52 43 39 68 68 64 55 45 44 800

1000 0.36 0.79 61 61 60 55 48 42 63 64 62 55 48 43 67 67 65 57 50 44 72 72 68 60 50 47 1000

400 0.03 0.11 52 44 36 <20 <20 <20 54 56 51 40 32 <20 56 62 57 47 39 37 58 64 61 51 44 44 400

600 0.06 0.24 53 51 46 36 29 <20 55 60 57 47 40 34 61 66 63 53 45 42 62 69 55 57 50 47 600

800 0.11 0.42 55 57 53 43 38 32 59 64 61 52 46 40 65 70 67 58 51 46 67 73 68 61 55 50 800

1000 0.17 0.66 56 63 60 51 46 40 62 67 64 51 51 46 69 74 70 62 56 51 72 76 71 65 59 54 1000

700 0.06 0.15 50 49 44 34 <20 <20 52 57 56 47 39 33 59 63 61 52 47 45 64 67 65 57 51 51 700

900 0.1 0.25 52 54 50 41 36 29 57 61 59 52 44 38 63 66 64 56 51 47 68 70 67 60 54 53 900

1100 0.14 0.37 54 58 55 47 41 35 60 64 62 56 49 43 67 69 67 60 55 50 70 73 70 63 57 55 1100

1300 0.2 0.51 55 62 59 52 47 42 62 66 64 58 52 47 68 72 69 63 57 53 73 76 72 66 60 57 1300

700 0.04 0.13 50 49 44 34 <20 <20 52 57 56 47 39 33 59 63 61 52 47 45 64 67 65 57 51 51 700

900 0.06 0.22 52 52 47 38 31 27 56 60 57 49 42 36 62 66 64 56 51 48 67 70 68 60 54 53 900

1100 0.09 0.33 53 54 50 41 35 30 59 63 58 51 45 39 65 69 67 60 54 51 70 73 70 63 57 55 1100

1300 0.13 0.46 54 56 53 44 38 32 62 66 59 52 47 42 68 72 69 63 57 53 73 76 72 66 60 57 1300

1000 0.06 0.15 52 51 46 36 31 27 57 55 52 46 41 36 63 61 58 51 46 46 67 66 63 56 51 49 1000

1500 0.15 0.34 55 56 51 42 36 31 62 61 58 52 47 43 68 66 63 57 52 50 73 70 68 60 56 54 1500

2000 0.26 0.61 56 58 55 47 41 35 67 66 64 59 53 50 72 70 68 61 56 55 77 75 72 64 60 58 2000

2400 0.37 0.88 58 61 59 52 46 39 70 69 67 60 56 53 75 73 71 64 59 58 80 80 74 68 62 60 2400

1000 0.06 0.15 52 51 46 36 31 27 57 55 52 46 41 36 63 61 58 51 46 46 67 66 63 56 51 49 1000

1500 0.14 0.35 55 56 51 42 36 31 62 61 58 52 47 44 68 66 63 57 52 50 73 70 68 60 56 54 1500

2000 0.24 0.62 56 58 55 47 41 35 66 65 63 57 52 49 72 70 67 61 56 54 77 74 72 65 60 58 2000

2400 0.35 0.89 58 61 59 52 46 39 70 69 67 60 56 53 75 73 71 64 59 58 80 78 74 68 62 60 2400

1500 0.1 0.21 54 53 48 39 33 29 59 58 55 50 46 41 65 65 62 56 52 49 71 70 68 61 56 53 1500

2000 0.18 0.37 56 56 52 43 37 32 62 61 56 53 49 45 69 68 66 60 56 53 75 72 70 63 58 57 2000

2500 0.28 0.58 57 59 56 47 41 35 66 64 63 57 52 48 72 71 69 63 59 56 78 76 73 67 62 60 2500

3000 0.4 0.83 59 62 60 53 47 40 68 66 67 60 56 52 75 73 72 66 61 59 81 79 76 70 65 63 3000

1500 0.07 0.18 54 53 48 39 33 29 59 58 55 50 46 41 65 65 62 56 52 49 71 70 68 61 56 53 1500

2000 0.12 0.32 56 56 52 43 37 32 62 61 59 53 49 45 69 68 66 60 56 53 75 72 70 63 58 57 2000

2500 0.19 0.5 57 59 56 47 41 35 66 64 63 57 52 48 72 71 69 63 59 56 78 76 73 67 62 60 2500

3000 0.27 0.72 59 62 60 53 47 40 68 66 67 60 56 52 75 73 72 66 61 59 81 79 76 70 65 63 3000

2500 0.14 0.31 56 57 52 43 36 32 62 61 59 59 49 45 69 68 66 60 56 53 75 73 71 65 60 57 2500

3000 0.2 0.45 57 58 55 47 40 34 65 63 62 56 51 48 72 70 69 63 59 56 78 75 73 67 62 60 3000

3500 0.27 0.61 58 60 57 49 43 37 67 65 65 59 54 51 74 72 71 65 61 58 80 78 75 69 64 62 3500

4000 0.35 0.8 60 63 61 54 48 41 69 67 68 61 57 53 76 74 73 67 62 60 82 80 77 71 66 64 4000

CFM

E12

E14

F14

F16

C8

C10

D10

D12

Size

A6

B7

B8

F16

E14

F14

D12

E12

C10

D10

MinimumOperating

A6

B7

B8

C8

Air Flow Characteristics

CFM

Size

Octave Band

Sound Power Levels, dB

MIN ΔPs 3.0 ΔPs


Octave Band

.5" ΔPs


Octave Band

1.5" ΔPs


Octave Band

Notes:1. All sound data are measured in accordance with industry standard ARI-880 2. Sound power levels are in decibels, re 10-12 watts


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sound data

TABLE 30a: RADIATED SOUND POWER LEVELS WITH INTEGRAL ATTENUATOR

ΔPs ΔPt 2 3 4 5 6 7 2 3 4 5 6 7 2 3 4 5 6 7 2 3 4 5 6 7

200 0.05 0.11 <20 <20 <20 <20 <20 <20 50 <20 36 <20 <20 <20 51 45 41 34 <20 <20 53 50 49 40 34 31 200

300 0.11 0.24 <20 <20 <20 <20 <20 <20 51 43 39 33 <20 <20 53 48 44 37 30 <20 60 53 51 42 36 33 300

400 0.2 0.43 <20 <20 36 <20 <20 <20 52 46 42 36 30 <20 56 51 47 39 33 33 61 56 54 46 39 35 400

500 0.32 0.66 <20 43 38 <20 <20 <20 52 48 44 38 32 <20 62 56 52 45 37 34 65 60 56 47 41 37 500

300 0.05 0.12 <20 <20 <20 <20 <20 <20 51 42 37 31 <20 <20 52 46 42 35 <20 <20 54 51 50 41 35 33 300

400 0.08 0.21 <20 <20 <20 <20 <20 <20 52 44 40 34 <20 <20 55 49 45 38 31 <20 58 54 52 43 37 34 400

500 0.13 0.33 <20 <20 36 <20 <20 <20 52 46 42 36 30 <20 57 52 48 40 34 <20 61 56 54 45 39 35 500

700 0.25 0.64 <20 44 40 33 <20 <20 53 49 46 40 33 <20 64 58 54 47 39 34 67 62 58 49 42 38 700

400 0.06 0.13 <20 <20 <20 <20 <20 <20 52 43 38 32 <20 <20 53 47 43 36 30 <20 55 52 51 42 36 35 400

600 0.13 0.28 <20 <20 <20 <20 <20 <20 52 45 41 35 <20 <20 56 51 47 39 33 <20 60 57 53 45 39 36 600

800 0.23 0.5 <20 43 39 32 <20 <20 54 48 45 39 32 <20 61 55 51 44 37 32 64 61 57 48 41 38 800

1000 0.36 0.79 50 46 42 35 <20 <20 55 51 48 42 35 <20 65 59 55 48 40 35 68 64 60 50 43 39 1000

400 0.03 0.11 <20 <20 <20 <20 <20 <20 52 43 38 32 <20 <20 53 47 43 36 30 <20 55 52 51 42 36 35 400

600 0.06 0.24 <20 <20 <20 <20 <20 <20 53 45 41 35 <20 <20 56 51 47 39 33 <20 60 57 53 45 39 36 600

800 0.11 0.42 <20 43 39 32 <20 <20 54 48 45 39 32 <20 61 55 51 44 37 32 64 61 57 48 41 38 800

1000 0.17 0.66 50 46 42 35 <20 <20 55 51 48 42 35 <20 65 59 55 48 40 35 68 64 60 50 43 39 1000

700 0.06 0.15 <20 <20 <20 <20 <20 <20 51 43 40 33 <20 <20 56 50 46 40 35 32 62 58 54 46 39 35 700

900 0.1 0.25 <20 <20 36 <20 <20 <20 52 45 42 35 <20 <20 58 52 48 42 37 33 66 60 55 48 41 37 900

1100 0.14 0.37 <20 <20 39 <20 <20 <20 53 47 45 38 32 <20 60 54 50 44 39 35 69 62 57 50 43 40 1100

1300 0.2 0.51 <20 44 41 34 <20 <20 54 49 47 41 35 <20 63 57 53 47 41 36 72 63 58 51 45 42 1300

700 0.04 0.13 <20 <20 <20 <20 <20 <20 51 43 40 33 <20 <20 56 50 46 40 35 32 62 58 54 46 39 35 700

900 0.06 0.22 <20 <20 36 <20 <20 <20 52 45 42 35 <20 <20 58 52 48 42 37 33 66 60 55 48 41 37 900

1100 0.09 0.33 <20 <20 39 <20 <20 <20 53 47 45 38 32 <20 60 54 50 44 39 35 69 62 57 50 43 40 1100

1300 0.13 0.46 <20 44 41 34 <20 <20 54 49 47 41 35 <20 63 57 53 47 41 36 72 63 58 51 45 42 1300

1000 0.06 0.15 <20 <20 37 <20 <20 <20 52 46 43 38 <20 <20 57 54 48 42 36 <20 59 57 53 46 40 36 1000

1500 0.15 0.34 50 46 41 35 <20 <20 55 51 47 42 35 27 63 58 53 46 42 34 66 63 57 49 44 39 1500

2000 0.26 0.61 54 50 46 38 35 <20 59 55 52 45 42 32 67 62 57 49 47 42 72 67 61 53 50 44 2000

2400 0.37 0.88 58 54 49 40 37 28 63 59 55 47 44 36 70 64 60 51 50 45 76 70 63 56 54 49 2400

1000 0.06 0.15 <20 <20 37 <20 <20 <20 52 46 43 38 <20 <20 57 54 48 42 36 <20 59 57 53 46 40 36 1000

1500 0.14 0.35 50 46 41 35 <20 <20 55 51 47 42 35 27 63 58 53 46 42 34 66 63 57 49 44 39 1500

2000 0.24 0.62 54 50 46 38 35 <20 59 55 52 45 42 32 67 62 57 49 47 42 72 67 61 53 50 44 2000

2400 0.35 0.89 58 54 49 40 37 28 63 59 55 47 44 36 70 64 60 51 50 45 76 70 63 56 54 49 2400

1500 0.1 0.21 50 46 37 <20 <20 <20 55 51 43 38 <20 <20 62 60 53 43 38 29 68 63 58 49 42 39 1500

2000 0.18 0.37 54 49 43 35 29 <20 59 55 49 42 36 28 66 61 56 47 44 35 72 66 60 52 48 43 2000

2500 0.28 0.58 56 52 48 38 32 <20 61 57 54 45 39 33 70 63 59 50 47 41 76 68 62 55 51 46 2500

3000 0.4 0.83 59 55 52 40 35 30 64 60 58 47 42 38 73 66 61 52 50 46 80 70 64 57 54 49 3000

1500 0.07 0.18 50 46 37 <20 <20 <20 55 51 43 38 <20 <20 62 60 53 43 38 29 68 63 58 49 42 39 1500

2000 0.12 0.32 54 50 43 35 29 <20 59 55 49 42 36 28 66 61 56 47 44 35 72 66 60 52 48 43 2000

2500 0.19 0.5 56 52 48 38 32 <20 61 57 54 45 39 33 70 63 59 50 47 41 76 68 62 55 51 46 2500

3000 0.27 0.72 59 55 52 40 35 30 64 60 58 47 42 38 73 66 61 52 50 46 80 70 64 57 54 49 3000

2500 0.14 0.31 54 49 42 34 <20 <20 59 54 48 41 35 29 66 62 56 47 43 35 72 66 60 52 48 43 2500

3000 0.2 0.45 57 52 47 37 33 <20 62 57 53 44 40 30 69 63 59 50 47 39 75 68 62 54 52 46 3000

3500 0.27 0.61 58 54 50 39 34 27 63 59 56 46 41 35 71 65 60 52 49 43 78 69 63 56 53 48 3500

4000 0.35 0.8 60 56 53 41 36 31 65 61 59 48 43 39 74 67 62 53 51 47 81 71 65 58 55 50 4000

CFM

E14

F14

F16F16

Size

A6

B7

B8

C8

C10

D10

D12

E12

D12

E12

E14

F14

C10

D10

MinimumOperating

A6

B7

B8

C8

Air Flow Characteristics

CFM

Size

Octave Band


MIN ΔPs

3.0 ΔPs


Octave Band

.5" ΔPs


Octave Band

1.5" ΔPs


Octave Band


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model DU3 / DU4Dual Duct Non-Mixing

sound data

Inlet AirflowSize (CFM) 0.5 1.0 2.0 3.0 0.5 1.0 2.0 3.0

A5 125 --- --- --- --- --- --- --- ---175 --- --- 21 23 --- --- --- ---250 --- --- 25 27 --- --- 21 24300 --- 21 26 30 --- --- 24 26350 --- 24 29 33 --- 20 25 27

A6 200 --- --- 20 22 --- --- --- ---250 --- --- 22 25 --- --- 22 22300 --- --- 24 27 --- 20 26 27350 --- --- 25 30 --- 21 27 31400 --- --- 26 31 --- 23 29 34500 --- 22 27 32 --- 25 32 36

B7 250 --- --- 22 23 --- --- --- ---300 --- 24 24 26 --- --- 21 21400 --- 25 32 31 --- 20 26 27500 --- 26 36 37 --- 21 29 31600 20 27 37 40 --- 22 30 34675 21 29 38 41 --- 24 31 35

B8 350 --- --- 24 24 --- --- 24 24475 --- --- 30 30 --- --- 26 30600 --- 20 31 35 --- 20 30 35700 --- 21 32 36 --- 22 31 36800 --- 22 34 37 --- 22 32 37900 21 24 35 38 --- 24 34 38

C9 450 --- 20 27 34 --- --- 22 24525 --- 21 29 37 --- --- 25 26600 --- 22 30 38 --- --- 26 27700 --- 24 31 39 --- --- 27 31900 22 25 32 40 --- 20 29 321100 24 26 34 41 --- 21 30 35

C10 550 --- --- 26 31 --- 26 31675 --- 20 27 32 --- 27 32800 --- 21 29 34 --- 20 29 341000 --- 22 30 35 --- 21 30 351200 20 24 31 36 20 24 31 361400 23 26 32 37 21 25 32 37

D12 800 --- --- 29 32 --- --- 26 311000 --- --- 30 33 --- --- 27 321200 --- 20 31 34 --- --- 29 341400 --- 21 32 35 --- 20 30 351700 --- 24 34 36 --- 21 31 362000 23 26 35 37 --- 24 32 37

E14 1050 --- 20 30 32 --- --- 26 311400 --- 21 31 35 --- --- 27 321800 --- 22 32 36 --- 20 29 342200 --- 24 34 37 --- 21 30 352600 22 26 35 38 --- 24 31 363000 25 29 35 39 21 26 32 37

F16 1400 --- 21 31 35 --- --- 26 311900 --- 22 32 35 --- --- 27 322400 --- 24 34 36 --- 20 29 342900 20 26 35 38 --- 22 30 353500 24 29 36 39 20 25 31 364100 27 31 37 40 24 28 34 38

Radiated Noise Criteria (NC)∆Ps (in w.g.)

Discharge Noise Criteria (NC)∆Ps (in w.g.)

Table 28b: NC Values

Notes: 1. NC values are calculated based on procedures outlined in ARI standard 885, appendix Eas shown in table 2

2. Where no NC value is shown (---), NC values are less than 20


Radiated 2 1 0 0 0 0 Environmental EffectAll Sizes 16 18 20 26 31 36 Type II Mineral Fiber

18 19 20 26 31 36 Total dB Reduction


Discharge 2 1 0 0 0 0 Environmental EffectSizes 5-7 2 4 10 20 20 14 5 ft., Duct Lining (12x12)(300-700 9 5 2 0 0 0 End Reflectioncfm) 6 10 18 20 21 12 5 ft., 8 in. Flex Duct



Discharge 2 1 0 0 0 0 Environmental EffectSizes 2 3 9 18 17 12 5 ft., Duct Lining (15x15)8-24x16 9 5 2 0 0 0 End Reflection(>700 cfm) 6 10 18 20 21 12 5 ft., 8 in. Flex Duct


Table 2: ARI Attenuation Table


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sound data

Inlet AirflowSize (CFM) 2 3 4 5 6 7 2 3 4 5 6 7 2 3 4 5 6 7 2 3 4 5 6 7A5 125 49 48 43 41 37 33 51 52 49 46 44 42 51 53 53 51 52 50 51 54 55 53 55 55

175 51 52 46 43 39 35 54 56 51 49 46 43 56 60 57 54 53 51 56 60 59 57 56 56250 54 55 50 47 42 38 57 59 54 51 48 45 61 63 60 57 54 52 61 65 63 61 58 57300 55 56 52 49 45 41 58 61 57 53 49 46 63 65 62 59 55 53 64 67 65 62 59 58350 56 57 54 53 49 45 61 62 59 55 51 48 64 66 64 60 56 55 66 68 67 63 60 59

A6 200 51 52 46 46 42 36 55 58 53 51 48 44 56 59 59 56 54 52 56 60 60 59 57 56250 52 54 48 47 43 39 57 61 54 53 50 46 60 64 62 59 56 53 60 64 63 62 59 57300 53 56 50 49 44 40 58 62 55 54 51 47 61 67 63 60 58 54 62 68 66 64 61 58350 55 58 52 51 45 41 59 63 56 55 52 48 63 68 64 62 59 55 64 71 68 66 63 59400 57 60 55 53 46 43 60 64 58 57 53 49 64 69 65 63 60 56 65 73 70 67 64 60500 60 62 58 58 48 46 63 66 62 60 54 51 67 72 67 65 61 57 68 75 71 68 66 61

B7 250 51 52 46 45 41 38 54 57 53 50 48 46 56 60 60 56 54 53 57 60 61 60 58 57300 52 53 47 46 42 39 56 59 54 51 49 47 59 63 61 58 55 54 59 63 63 61 59 58400 53 56 49 49 43 41 57 62 55 54 50 49 61 67 63 60 57 56 62 68 66 64 61 60500 54 58 52 52 45 43 58 63 56 55 51 50 62 69 64 62 58 57 64 71 68 66 62 61600 56 59 55 55 47 45 59 64 59 58 52 51 64 70 65 63 59 58 66 73 69 67 63 62675 59 61 58 58 48 46 61 65 62 60 54 52 65 71 66 64 60 58 67 74 70 68 64 63

B8 350 53 53 47 47 45 40 58 61 55 54 51 47 59 66 62 61 58 55 60 66 66 65 62 58475 54 55 49 49 46 41 59 62 56 55 53 48 63 68 63 62 59 56 64 71 68 67 63 59600 55 57 51 52 48 43 60 63 57 57 54 49 64 71 64 63 60 57 65 75 70 68 65 60700 56 59 53 54 49 44 61 64 58 58 55 50 65 72 65 64 61 58 66 76 71 69 66 61800 58 61 56 57 50 46 62 65 60 60 56 51 66 73 66 65 62 58 68 77 72 70 67 62900 60 62 59 59 52 48 63 66 61 61 57 52 67 74 67 66 63 59 69 78 73 71 68 63

C9 450 52 50 46 46 44 40 58 59 52 51 50 48 62 65 60 58 56 55 63 66 65 63 60 59525 53 51 47 47 45 41 59 60 53 52 51 49 63 67 61 59 57 56 65 68 66 64 61 60600 54 53 48 48 47 42 60 61 54 53 52 50 65 68 62 60 58 57 66 69 67 65 62 61700 55 55 49 49 48 43 61 62 55 54 53 51 66 69 63 61 59 58 67 72 68 66 63 62900 56 57 51 51 49 44 62 63 56 56 54 52 67 70 64 62 60 59 69 73 69 67 64 631100 60 60 57 57 50 47 63 64 59 59 55 53 68 71 65 64 62 60 71 75 70 68 66 65

C10 550 51 53 48 48 46 41 56 61 55 54 53 50 61 68 64 62 60 57 62 72 68 66 64 61675 52 54 49 49 47 42 57 62 56 55 54 51 63 69 65 63 61 58 64 73 69 67 65 62800 54 56 51 50 48 43 58 63 57 57 55 52 64 70 66 64 62 59 65 74 70 68 66 631000 55 60 53 53 50 46 59 64 58 58 56 53 65 71 67 65 63 60 67 75 71 69 67 641200 57 63 56 56 52 49 60 66 60 60 57 54 66 72 68 66 64 61 68 76 72 70 68 651400 59 64 59 59 53 51 62 67 62 62 59 55 67 73 69 67 65 62 69 77 72 71 69 66

D12 800 54 53 49 48 47 41 60 59 56 55 53 50 67 68 67 62 61 57 68 72 69 67 65 621000 55 54 51 49 48 43 61 60 57 56 54 51 68 69 68 63 62 58 70 73 70 68 66 631200 56 56 53 51 49 44 62 62 58 57 55 52 69 70 69 64 63 59 71 74 71 69 67 641400 57 58 55 53 50 46 63 63 59 58 56 53 70 71 70 65 64 60 72 75 72 70 68 641700 59 60 58 56 52 48 64 64 61 60 58 54 71 72 71 66 65 61 73 76 73 71 69 652000 62 62 61 58 54 51 66 66 64 62 59 56 72 73 72 67 66 62 74 77 74 72 70 66

E14 1050 54 52 50 50 49 46 62 61 57 56 55 54 67 68 65 63 61 59 68 72 69 67 66 631400 56 54 52 51 50 47 63 62 58 57 56 55 68 69 66 64 62 60 72 73 70 68 67 641800 59 56 55 54 51 48 64 63 60 58 57 56 69 70 67 65 63 61 72 74 71 69 68 652200 61 59 57 55 52 49 65 64 61 60 58 57 70 71 68 66 64 62 73 75 72 70 69 662600 63 61 61 57 55 51 67 66 63 61 59 57 72 72 69 67 66 64 74 76 73 71 70 673000 65 64 64 60 57 54 69 68 66 62 61 58 73 73 70 68 67 65 76 77 74 72 71 68

F16 1400 56 52 51 51 49 45 62 60 57 55 56 54 69 68 65 62 61 60 70 72 70 66 65 641900 58 54 53 53 50 46 64 61 58 57 57 55 70 69 66 63 62 61 72 73 71 67 66 652400 61 57 55 54 52 48 65 63 60 59 58 56 71 70 67 64 63 62 74 74 72 68 67 662900 64 60 58 56 53 50 68 65 62 60 59 57 73 71 68 66 65 63 76 75 73 69 68 673500 68 63 62 59 56 53 71 67 65 62 61 58 75 72 70 67 66 64 78 76 74 70 70 684100 70 66 67 61 58 55 73 69 68 64 62 59 77 74 72 68 68 65 79 78 75 72 71 69

Table 29b: Discharge Sound Power Data (dB)


0.5” ∆PsSound Power Levels, dB

Octave Band


Octave Band


Octave Band


Octave Band

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sound data

Inlet AirflowSize (CFM) 2 3 4 5 6 7 2 3 4 5 6 7 2 3 4 5 6 7 2 3 4 5 6 7A5 125 46 41 33 30 27 24 51 43 39 34 33 27 50 46 43 39 38 33 50 47 44 42 42 37

175 49 44 35 31 28 25 52 48 41 37 35 28 54 51 47 42 40 34 54 52 49 45 44 38250 52 47 39 33 30 26 55 51 44 38 36 29 58 56 50 45 43 35 58 58 53 48 46 39300 53 49 41 35 32 27 56 53 46 40 37 30 60 57 52 46 44 36 60 60 55 50 48 40350 54 50 44 37 34 32 58 55 48 41 39 34 62 58 54 47 45 38 62 61 58 51 49 41

A6 200 49 42 35 29 28 27 52 47 40 34 34 31 52 49 46 39 40 37 53 50 48 42 43 40250 50 43 36 30 30 28 53 48 41 35 35 32 55 53 48 41 41 38 55 53 51 44 44 41300 51 44 37 31 31 29 54 49 42 36 36 33 57 55 49 42 42 39 57 56 53 46 45 42350 52 45 39 32 32 30 55 50 43 37 37 34 58 56 50 43 43 40 59 59 55 48 46 43400 53 46 41 34 33 31 56 51 44 38 38 35 60 57 51 44 44 41 60 61 56 49 47 44500 56 50 45 38 37 35 58 53 48 40 40 38 62 58 53 46 45 42 63 62 57 50 49 45

B7 250 50 46 38 33 30 26 52 51 44 39 36 31 52 52 48 43 41 36 52 53 49 46 44 41300 51 47 39 35 31 27 53 55 46 40 37 32 53 55 50 45 43 38 54 56 52 48 45 42400 52 48 40 36 33 28 56 56 48 42 39 33 56 62 54 49 45 40 57 61 56 51 48 43500 55 49 42 38 34 30 57 57 49 43 40 34 59 65 58 52 47 41 59 66 60 55 50 45600 58 50 45 40 36 31 60 58 50 44 41 35 61 66 59 53 48 42 61 69 63 58 52 46675 59 51 47 42 38 32 61 59 51 45 42 36 64 67 60 54 49 43 63 70 65 60 53 47

B8 350 49 44 36 31 29 29 53 50 43 38 36 34 54 55 50 45 43 40 55 55 52 48 47 44475 50 45 37 33 32 30 54 51 44 39 37 35 56 60 51 46 44 41 57 60 56 51 48 44600 51 46 39 35 33 31 55 52 45 40 38 36 58 61 52 47 45 41 59 64 58 52 49 45700 53 47 41 37 36 32 56 53 46 41 39 37 60 62 53 48 45 42 60 65 59 53 50 46800 54 49 44 40 38 33 57 54 47 43 41 38 61 63 54 49 46 43 62 66 60 54 50 47900 56 50 47 43 40 35 59 55 49 45 43 39 63 64 55 50 47 44 63 67 61 55 51 47

C9 450 47 44 37 33 31 26 51 52 43 38 36 31 55 58 51 45 43 38 57 63 55 49 47 42525 48 45 38 34 32 27 52 53 44 39 37 32 57 59 52 46 44 39 58 66 57 50 48 43600 49 46 39 35 33 28 53 54 45 40 38 33 58 60 53 47 45 40 59 67 58 51 49 44700 53 49 41 36 34 29 54 55 46 41 39 34 59 61 54 48 46 41 60 68 59 52 50 45900 55 54 45 39 36 31 55 56 48 43 40 35 60 62 55 49 47 42 61 69 60 53 51 461100 56 55 48 42 38 33 56 57 50 44 41 36 61 63 56 50 48 44 63 70 61 54 52 47

C10 550 49 43 38 34 33 28 52 51 43 40 39 35 54 57 50 46 45 40 55 61 53 51 48 43675 50 44 40 36 34 29 53 52 44 41 40 36 56 58 51 47 46 41 56 62 54 51 49 44800 51 46 41 37 35 30 54 53 45 42 41 37 57 59 52 48 47 42 58 63 55 52 50 451000 52 48 44 39 37 31 55 54 47 43 42 38 59 60 53 49 48 43 60 64 56 53 51 461200 55 51 46 41 39 34 57 55 49 45 43 39 61 61 54 50 49 44 62 65 57 53 52 471400 57 53 49 44 41 36 59 56 52 48 46 40 63 62 55 51 50 45 64 66 58 54 53 48

D12 800 51 44 37 34 33 27 56 50 43 39 39 33 60 59 51 46 44 39 60 60 57 50 48 431000 52 45 38 35 34 29 57 51 44 40 40 34 62 60 52 47 45 40 62 62 58 51 49 441200 53 47 40 37 35 30 58 52 45 41 41 35 63 61 53 48 46 41 64 63 59 52 50 451400 54 48 42 39 36 31 59 53 46 43 42 36 64 62 54 49 47 42 66 64 59 53 51 461700 56 51 45 42 39 32 60 55 48 45 43 37 65 63 55 50 48 43 68 65 60 54 52 472000 58 53 49 45 42 35 62 57 51 47 45 38 67 64 56 51 49 44 69 66 60 55 53 48

E14 1050 51 44 36 35 34 30 57 52 42 39 39 36 61 60 51 47 45 42 61 63 55 50 49 451400 52 45 39 36 36 31 58 53 43 40 40 37 63 61 52 48 46 43 64 64 56 51 50 461800 54 48 41 38 37 32 59 54 45 43 42 38 64 62 53 49 47 44 66 65 57 52 51 472200 56 51 45 41 39 35 60 55 47 44 44 39 65 63 54 50 49 45 67 66 58 53 52 482600 59 54 48 44 42 37 62 57 50 46 45 41 66 64 55 51 50 46 69 67 59 54 53 493000 61 56 51 47 45 40 64 59 53 49 47 43 68 64 56 52 52 47 70 68 60 55 54 50

F16 1400 50 45 38 36 37 32 57 53 44 41 40 37 61 61 51 48 46 42 63 64 55 51 50 461900 52 47 40 38 38 33 58 54 45 42 41 38 64 62 52 49 47 43 65 64 56 52 51 472400 55 50 43 41 40 36 60 55 46 45 44 39 65 63 53 50 48 44 67 65 57 53 52 482900 58 52 45 43 41 38 62 57 48 46 46 41 67 64 54 51 50 46 69 67 58 54 53 493500 61 55 48 45 43 40 64 59 51 48 47 42 68 65 55 52 51 47 70 68 59 55 54 504100 64 58 52 48 45 42 66 61 54 50 49 44 69 66 56 53 52 48 71 69 60 56 55 51

Table 30b: Radiated Sound Power Data (dB)

Notes: 1. All sound data are measured in accordance with industry standard ARI-880 2. Sound power levels are in decibels, re 10-12 watts


Octave Band


Octave Band


Octave Band


Octave Band

model DUDual Duct

features at a glanceD

ual D

uct A

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C-15

❏ 1 Row Hot Water Coil❏ 2 Row Hot Water Coil❏ 4 Row Hot Water Coil❏ Electric Coil

❏ Right Hand Connection❏ Left Hand Connection

REHEAT OPTIONS

❏ 1/2" Matte Insulation❏ 1" Matte Insulation❏ 1/2" Foil Faced Insulation❏ 1" Foil Faced Insulation❏ 1" Fibre-Lok Insulation❏ 3/8" Fiber-Less Insulation❏ Dual Wall

CASING TREATMENTS

❏ Bottom

ACCESSORIES

CASING OPTIONS❏ Unit Mounting Bracket (shipped loose)❏ Standard Control Enclosure❏ Large Control Enclosure❏ Hinged Front Panel (control enclosure)

ACCESS DOORS

❏ Patch Plate❏ Double Camlock

❏ Hinged Camlock

ELECTRIC CONTROLS❏ Control Transformer❏ Low Voltage Control

Disconnect Switch❏ Low Voltage Fuse & Fuse Block❏ Low Voltage Disconnect Switch❏ Low Voltage Power-Fusing❏ 24 VAC Actuator

❏ 120 Volts❏ 208 Volts❏ 240 Volts

❏ 277 Volts❏ 480 Volts

❏ 1 Phase ❏ 3 Phase

❏ 1 Step❏ 2 Step

❏ 3 Step

❏ Door Interlocking DisconnectSwitch, Non-Fused

❏ Power Fusing❏ Primary Fused Transformer

ELECTRIC COILS

❏ DU1 - AttenuatorFlanged Discharge

❏ DU2 - Attenuator Slip & Drive Discharge

❏ DU3 - Short DUFlanged Discharge

❏ DU4 - Short DU Slip & Drive Discharge

MODEL

❏ A❏ B❏ C

❏ D❏ E❏ F

BOX SIZE

HOT INLET❏ 5" Ø❏ 6" Ø❏ 7" Ø❏ 8" Ø❏ 9" Ø❏ 10" Ø❏ 12" Ø❏ 14" Ø

❏ 16" ØINLET SIZE

❏ Pneumatic Controls❏ Electronic Analog Controls❏ Direct Digital Controls

(DDC)❏ Electric ControlsControl strategies availablefor all applications

CONTROL SYSTEM

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model DUDual Duct

typical specification

GENERALProvide and install Anemostat dual duct air terminals, Model DU,where shown on drawings or schedule, that comply with the indi-cated size, capacity, and performance ratings. The air terminalsshall be single unit construction, factory constructed and assem-bled. The terminals shall have been tested and performance deter-mined in accordance with industry standards ARI 880 andASHRAE 130.

ACOUSTICAL PERFORMANCEThe air terminal radiated and discharge sound levels shall notexceed the power levels as scheduled, at the differential staticpressure (dPs) shown.

Leakage, Damper & CasingThe damper leakage shall not exceed 2% of the maximum ratedcapacity of the inlet at 4" Differential Static Pressure. The air ter-minal casing leakage shall not exceed 1/2% of the maximum ratedcapacity of the casing at 1/2" static pressure in the casing.

ACOUSTIC LININGThe air terminal shall be internally lined with a minimum of 1/2"thick, dual density thermal-acoustical glass fiber insulation. Theinsulation shall conform to the requirements of NFPA 90A and UL181. The insulation shall be surface treated to prevent erosion andfibers entering the air stream. (Option 1) The air terminal shall beinternally lined with (1/2")(1") thick foil-faced insulation, with an alu-minum laminate facing. The aluminum laminate shall face the airstream to prevent erosion and airborne fibers. The edges of theinsulation shall be sealed with aluminum tape, and the insulationshall meet NFPA 90A, UL181, ASTM C665, and shall beapproved for use by the California Office of Statewide Health,Planning and Development (OSHPD).

(Option 2) The air terminal shall be internally lined with AnemostatFiber-Lok Insulating system, consisting of minimum 1" thick, 4 1/4lb/ft3 thermal-acoustical fiber board insulation, with an aluminumlaminate facing. The aluminum laminate shall face the air streamto prevent erosion and airborne fibers. Any exposed edges of theinsulation shall be captured in zinc-coated steel channels, and theinsulation shall meet NFPA 90A, UL181, ASTM C665, and shallbe approved for use by the California Office of Statewide Health,Planning and Development (OSHPD).

CONSTRUCTIONInlets/CasingThe air terminal casing and primary air inlets shall be constructedof minimum 22 gauge zinc-coated sheet steel. (Option 1) The cas-ing shall include steel control enclosures, housing all primary flowcontrols, including actuators, controllers, relays, etc.

DamperThe primary air dampers shall consist of a single elliptical bladecomposite, that requires nominal 60 degree rotation from fullyopened to fully closed positions. The steel damper blade shall bemechanically attached to the shaft with either threaded fasteners,or welded. Rivets are not acceptable. The shaft shall be a continu-ous, singular axle across the full inlet diameter, and extendingthrough the terminal casing. The damper shall have a tear resist-ant neoprene lip seal around its perimeter to form a tight air sealfor full shut-off. Seals other than neoprene are not approved. Thedamper shafts shall rotate in self lubricating bearings. Damperposition shall be indicated on the end of the shaft on the outside ofthe casing. The primary damper fail positions for pneumatic appli-cations (normally open / normally closed) shall be easily re-config-ured in the field.

PNEUMATIC AIR FLOW SENSORSThe primary air shall be measured by a multi-point, cross type flowsensor of the automatic averaging type, located in each primary airinlet for Inlet (I) sensing control strategies, and shall accuratelysense primary air flow within +/-5% for any inlet condition of equalsized duct. For Inlet-Total (I-T) sensing control strategies, a multi-point total flow sensor, located in the discharge of the terminal,shall measure the combined hot and cold air flow rates, and onlyone inlet sensor shall be required.

HOT WATER HEATING COILSHot water coils, 1 or 2 row as required, shall be factory mountedat the discharge of the air terminal. Hot water coils shall beventable and drainable. Coil construction shall include a 20 gaugezinc-coated sheet steel frame, with aluminum corrugated fins at10- fins/inch. Tubing shall be 1/2" O.D. copper, minimum .017"wall thickness, mechanically expanded in the aluminum fins.

ELECTRIC HEATING COILSElectric heating coils shall be of the size and capacity as shown onthe drawings or as scheduled. Electric duct heaters shall be of theopen coil design, and shall be listed by UL or ETL for zero clear-ance and shall meet the requirements of the National ElectricCode.

The electric heater frame and control panel shall be minimum 20gauge, zinc-coated sheet steel. Heating elements shall be of highgrade nickel, rated at 35 watts per square inch of wire surface.Elements shall be held in place with floating ceramic bushing, whichare held in place by minimum 20 gauge galvanized steel brackets.

Each electric heater shall be furnished with two over-temperaturesafety devices, serviceable and replaceable in the control enclosurewithout removing the heater from the duct. The primary safetydevice shall be a disc-type automatic reset that will shut off theheater during over temperature, and automatically reset the heaterwhen duct temperatures are within limits. The second safety deviceshall be a heat limiter in the power lines that opens the circuit andde-energizes the elements if the primary safety device fails. Eachheater shall be furnished with a specific wiring diagram. Eachheater shall include an air proving switch, PE switch or contactorper step, overcurrent protection as required by N.E.C. or U.L., anda door interlocking disconnect switch. All power lines shall be bro-ken when the hinged heater door is opened.

PNEUMATIC CONTROL SYSTEMThe air terminal pneumatic controls shall be suitable for a 20 psicontrol system. The controls shall be pressure independent, andshall be capable of maintaining air flow set point within +/-5% ofthe design air volume regardless of changes in system static pres-sure. An identification label, control diagram, and inlet sensor flowchart shall be attached to each terminal. The sequence of opera-tion is based on Anemostat Control Package DP- _________. Thepneumatic velocity controllers shall be furnished and mounted bythe terminal manufacturer, and the maximum & minimum primaryair flow shall be set at the factory. The controller shall beAnemostat (Model 23/24) (Model 31 and shall maintain a con-stant reset span independent of the primary air flow rate).Balancing taps, separate from the sensor or controller taps, shallbe provided for field adjustment of set points. The controls shallreset flow, as dictated by the space thermostat (furnished by theTC). Controller air consumption for each controller shall not exceed(Model 23, 24 - .009 scfm @ 20 psi) (Model 31 - .017 scfm @20 psi). CFM limiters are not acceptable. The air flow sensorsshall amplify the velocity pressure signals and provide closed loopfeedback of actual flow to the velocity controllers. The pneumatic

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C-17

actuators shall be furnished and mounted by the unit manufacturerto move the primary damper in response to the demand of thepressure independent velocity controllers. The actuator shall becapable of positioning the damper from full open to full closed, andto any modulated mid-position. The use of mechanical stops toposition the dampers for flow control is not acceptable. Thedampers shall fail in an (open) (closed) position should the controlair drop to 0 psi.

ELECTRONIC ANALOG CONTROL SYSTEMThe air terminal analog controls shall be pressure independent,and shall be capable of maintaining air flow set point within +/-5%of the design air volume regardless of changes in system staticpressure. An identification label, control diagram, and inlet sensorflow chart shall be attached to each terminal. The sequence ofoperation is based on Anemostat Control Package DA-__________.A transformer shall be furnished and mounted by the unit manu-facturer to step down the primary line voltage as required. All con-trols shall be mounted within a steel enclosure. The electric actua-tor and controller shall be combined as a single component. Theelectric actuator shall be designed for permanent stall utilizing amagnetic clutch. The actuator shall develop a minimum 45 inch-

pounds torque. The controller shall maintain a constant reset spanregardless of maximum and minimum flow settings, and shall resetthe flow linearly with respect to room temperature changes. Thewall thermostat, factory set for design primary air flows, shall befurnished by the terminal unit manufacturer for installation by thetemperature control contractor. Primary air flow adjustments shallbe made at the wall thermostat utilizing a digital voltmeter. Air flowsensors shall provide closed loop feedback of actual flow to thevelocity controller.

DIRECT DIGITAL CONTROL SYSTEMThe air terminal DDC controls, including the controller(s), air flowtransducers, actuators, and 24vac transformer, shall be providedby the ATC contractor to the terminal manufacturer for factorymounting. It shall be the responsibility of the DDC control supplierto forward specific wiring diagrams to the factory. The terminalmanufacturer shall provide the pneumatic primary inlet flow sensors.

Heating Ventilating Air Conditioning Guide - Circa 1959Published by ASHAE

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