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Technical Brochure

LTG Air Diffusers

The Innovation Company

LTG Aktiengesellschaft

Linear air diffusers LDB

Installation in ceilings, walls and sills



© LTG Aktiengesellschaft • Grenzstraße 7 • 70435 Stuttgart • Germany LDB-eng-TP (10/14)Tel. +49 711 8201-0 • Fax +49 711 8201-720 • [email protected] • www.LTG-AG.comFormer editions are invalid · Subject to technical modifications page 2 of 27

Technical brochure • Linear air diffusers LDB

LTG Comfort Air Technology

Air Distribution

Air-Water Systems

Air Diffusers

NotesDimensions stated in this brochure are in mm.

Dimensions stated in this brochure are subject to General Tolerances according to DIN ISO 2768-vL.

Length tolerance : ≤1.5 m ± 1.5 mm≥1.5 m ± 2.0 mm

For the outlet grille see the special tolerances specifiedin the drawing.

Straightness and twist tolerances for extruded aluminum profiles according to DIN EN 12020-2.

For punched profiles - LDB 12 and LDB 15 - twice thestraightness and torsion tolerances acc. toDIN EN 12020-2.

The surface finishes meet standard indoor use requirements, i.e. room climate requirements according to DINEN ISO 7730. Other finishesmeeting special use requirements are available on request.

The actual tender documentations are available in wordformat at your local dealership or at www.LTG-AG.com.

Please note!The profiles for our linear diffusers are exclusively de-signed for use asdecoration elements to cover the gapbetween the ceiling and the diffuser. They are not suitablefor use as supporting profiles or fasteners!

Content Page

Product overview 4

General description 5

Diagram for “air only” systems 6

Selection diagram 7

Selection LDB 12/8 and 12/M 8

Dimensions LDB 12/8 and 12/M 9

Border profiles / additional profilesfor LDB 12/8 and 12/M

10

Insertion loss LDB 12/8 and 12/M 11

Selection LDB 20/8 12

Dimensions LDB 20/8 13

Border profiles / additional profilesfor LDB 20/8

14

Insertion loss LDB 20/8 15

Selection LDB 12 and 15 16

Dimensions, border profiles for LDB 12 17


Selection LDB 50 19


Installation 21

Accessories 22

Nomenclature, ordering code 27





Air Diffusers for Ceiling Installation

LDB

LDB linear air diffusers with variable settings ensure effective ventilation and opti-

mized air conditions.

Advantages

Comfortable:

High induction air diffusers ensure rapidmixing

of supply and room air to create comfortable

thermal environments

Uniform, optimal purging of the roomwith fresh

air

A pleasant indoor climate thanks to uniform tem-

perature distribution

Quiet: Low-noise air distribution,aerodynamically

optimized inner cylinder contours

Variable:Limitless options for design, colour and

surface appearance, can be perfectly integrated

in all ceilings

Profiles are available in all colour systems (e.g.

RAL , Pantone, …) and can be combined individually

LTG System clean® -unique and ingenious!

Contaminants within the room air like dust,

tobacco smoke, carpet abrasions, dust or oil

vapour deposit around the ceiling and diüfiuser

as a result of entrainment. The LTGSystem

clean®prevents surface staining almost com-

pletely by providing a screen of clean supply

air across the ceiling. Benefits: The costs of

renovation and maintenance are considerably

reduced.

Flexible: Can be adjustedto individual spatial condi-

tions without impeding operation




Technical brochure • Linear air diffusers LDBProduct overview

TypeLDB 12/MLTG System clean®

LDB 12/8LTG System clean®

LDB 20/8 LDB 12

Air diffusionIndividuallyadjustable air flow

Individually adjustable air flow, even after installation

Special features

Completely madefrom metal, non-flammable

For high comfort For high comfort For an inconspicuous installation inshaded joints andsuspended ceilingsLTG System clean® to reduce contamina

tion around the diffuser

Profile width [mm] 41…129 31...240 31...240 15 resp. 28

Cylinder Ø [mm] -- 12 20 12

Recommendedair flow rate

at LWA

[m³/hm]

[dB(A)]

1 slot: 702 slots: 1303 slots: 190

30

1 slot: 702 slots: 1303 slots: 1905 slots: 25030

1 slot: 1102slots: 1903 slots: 2504 slots: 30030

65

35

Slot rows 1…3 1...4 1...4 1

Recommendedinstallationheight

[m] from 2,4 from 2,4 from 2,6 from 2,4

Length [mm] up to 2500 up to 2000 up to 2000 up to 1500

Version

Profile surface: untreated aluminium, anodized, painted similar to RAL.The diffusers can alternatively be ordered without air distribution box.

Diffuser elements:natural anodized,painted similar toRAL

Diffuser elements:black, white or aluminium grey, on request in other colours similar to RAL

Accessories For integration in the ceiling, a variety of border and additional profiles is available.

Type LDB 15 LTG System clean® LDB 50

Air diffusion Individually adjustable air flow, even after installation

Special featuresLTG System clean® to reduce contaminationaround the diffuser

For high ceilings and large flow rates

Profile width [mm] 15 resp. 25 100, 200, 300

Cylinder Ø [mm] — 50

Recommendedair flow rate

at LWA

[m³/hm]

[dB(A)]

up to 60

25

1 slot: 3102 slots: 4303 slots: 51038

Slot rows 1 1...3

Recommendedinstallationheight

[m] from 2,4 from 3,5

Length [mm] up to 2000 up to 2100

VersionProfile surface: untreated aluminium, anodized, painted similar to RAL.Diffuser elements: white or aluminium grey, on request in other colours similar to RAL.The diffusers can alternatively be ordered without air distribution box.

Accessories For integration in the ceiling, a variety of border and additional profiles is available.




Technical brochure • Linear air diffusers LDBGeneral Description

Product viewsType LDB 12/8 LTG System clean®

Type LDB 12/M LTG System clean®

Type LDB 20/8

Type LDB 12

Type LDB 15 LTG System clean®

Type LDB 50

ApplicationLTG diffusers type LDB are suitable for all kinds of applications, e.g. rooms with:

- high comfort requirements such as offices

- increased heat loads and fresh air requirements suchas labs or conference rooms

- special requirements regarding acoustics such asbroadcasting studios

- constant temperature requirements such as production halls.

LTG diffusers type LDB are perfect for both supply airwith a constant or varying volume flowrateand returnairwith the same diffuser element adjustment.

Installation, positioningLTG diffusers type LDBmay be installed in ceilings, wallsor sills depending on the looks desired, the existing airconditioning system and the intended use. Also availableare diffusers for special requests.

Flexibility regarding the interior design, by ensuring boththe use for an inconspicuous installation and as an eye-catching decoration element.

FunctionThe LTG diffuser type LDB is an adjustable linear diffuserallowing treated air to be distributed precisely within theroom, thus ensuring both highest thermal and acousticcomfort.

The diffuser consists of diffuser elements with an optimized interior and profile contour, mounted in aerodynamically harmonized aluminium frames. Each of thediffuser elements can be adjusted individually, thus permitting a large number of different flowpatterns, varyingfrom a flat ceiling flow to a broad fan jetwith amaximumof 36 micro-jets per meter diffuser length (exc. LDB 15).

These features ensure low air speeds and a rapid reduction of temperature differences within the room, some ofthe basic requirements for agreeable conditions in theoccupied space.

The highly inductive effect produces a stable flowpatternand permits supply air temperatures up to 12 K lowerthan the ambient temperature.




Technical brochure • Linear air diffusers LDBSelection

Diagram for “air only” systems

5 6 7 8 9 10 12 14 16 18 20 25 30 50

10

20

30

40

50

60

70

8090100

150

200

4035

1.5 2 3 4 5 6 7 8 9 10 12 14 16

Specific volume flow rate [m3/(hm2)]

Ventilation rate [1/h] based on a room height of 2.75 m

Specificco

olingca

pacity

[W/m

2]

c max

=0.15m/s

c max

=0.18m/s

c max

=0.15m/s

c max

=0.205m/s

c max

=0.25m/s

Use of the diagramBased on the known value, i.e. the specific cooling load,the specific volume flow rate can be calculated by choosing the corresponding temperature and volume flow rateof the supply air dependingon thedesired roomtemperature of 22 or 26 _C respectively.

DIN limits should, however, be observed to avoid draftand other sources of discomfort.

If the ventilation rate is too high, additional means to reduce the cooling load should be considered already during planning (e.g. sun screens etc.).

Example:An office area of 30 m2 (room length 6 m, room width 5m) requires ventilation and cooling.

The desired room temperature is 26 _C.

With a specific cooling capacity of 40 W/m2 andΔt= -10 K, the specific volume flow rate is 12 m3/(hm2).

The supply air required is 360 m3/h.

5m

6 m

Floor area = 30 m2

Room temperature = 26 °CFlow rate = 360 m3/hΔt = -10K




Technical brochure • Linear air diffusers LDBSelection

Selection diagram

Flow rate per meter of diffuser [m3/(hm)]

Installationheight[m

m]

10 20 30 40 50 60 70 80 100 200 300 400 500

2

3

4

6

8

10

12

With the volume flow rate known and the installationheight taken into consideration, a quickdecision canbemade regarding the appropriate number of slot rowsand the diffuser type.

Since there usually is a choice of products, the diffusertype that suits the application best may be selected.

Example:Based on the example opposite, a volume flow rate of60 m3/(hm) is obtained. With a room height of 2.75 m,LDB 12/8/1 LTG System cleanR would be perfect, butLDB 20/8/1 might be installed just as well.

Diffuser Type LDB 12/8/1 LTG System cleanR

with a volume flowrate of 60m3/(hm)wasselected.

Example:

5m

6 m

Supply air through linear diffuserLDB 12/8/1 LTG System cleanR

Facade

Return air, e.g. through lamps




Technical brochure • Linear air diffusers LDBType LDB 12/8 and 12/M, LTG System cleanR - selection

Selection diagram

20 40 60 80 100

5

10

15

20

50

200

0,512

10

20

H = 2,8 m

h = 1,7 m

- 10

- 6

4030

20 30 40 50 60 80 100 200

15

20

25

30

35

-10∆t [K]

LDB 12/8/1, 12/M/1

- 6

10

20

H = 2,8 m

h = 1,7 m

- 10- 6

- 12LDB 12/8/2, 12/8/3, 12/M/2, 12/M/3

- 3

- 3

- 3

With undisturbed air diffusion

With undisturbed air diffusion

-12

a (cmax) [m]

V [m3/(hm)]

- 12

............... = dimensioning area beyond LTG System clean®

300

300

c max[cm/s] ∆t [K]

∆t [K]

∆p [Pa]

a(cmax) cmax

Legend

V = volume flow rate [m3/(hm)]tzu = supply air temperature [C]tRA = room air temperature [C]Δt = temperature difference

between tzu and tRA [K]Δp = pressure drop [Pa]LWA = sound power level [dB(A)]a(cmax)= extension of jet at which the

maximum speed of the ambientair was measured [m]

cmax = maximum speed of ambient airwith uniformly distributedthermal loads [cm/s]

H = room height [m]h = height of measuring point [m]

Note: The recommended min. distance between twoparallel diffusers should, in case of high temperaturedifferences t, not be less than the value of a (cmax).

The diagrams are based on measuring results with thestandard diffuser element adjustment and a roomheightof 2.8 m.

Example for diagram above

Volume flow rate per meter of diffuser:V = 60 m3/(hm)

Resulting data for type LDB 12/8/1:Δp = 7 PaLWA = 17 dB(A)Δt = -10 Ka(cmax)≈ 1 mcmax ≤ 5 cm/s




Technical brochure • Linear air diffusers LDBType LDB 12/8 and LDB 12/M, LTG System cleanR - dimensions

Air distribution boxes

61

d/2

+10

210 1

45 Ød

60

65 LDB 12/8/1

LDB 12/M/1

Profile detailssee next page

*

Ød

61

d/2

+10

265

60

LDB 12/8/2LDB 12/M/2


*

Ød

92

d/2

+10

250

60

LDB 12/8/3LDB 12/M/3


*

Air distribution boxes with insulation (double skin box)

91

d/2

+10

225

45

64

1515

Ød

15

LDB 12/8/1LDB 12/M/1


*

Ød

91

d/2

+10

280

45

67

15

15 15

LDB 12/8/2LDB 12/M/2


*

Ød

122

d/2

+10

265

45

67

15

15 15

LDB 12/8/3LDB 1/M/3


*

* Execution: integrated throttle damper DLU at spigot diameters 99...139The values given refer to standard versions.Reduced box sizes and spigot diameters are available on request, depending on volume flow rate and acoustic requirements.

Spigot dimensionsDiffuser length Lnom [mm] 500 750 1000 1250 1500 1750 2000

The given values LWA refer only to the execution without throttle damper resp. with throttle damper open.LDB 12/8/1, example: 70 m3/hm

LWA in dB(A) out of diagram p. 10 (ref. to Lnom) 19 21 22 23 24 24 25

Ø = 79 mm no. of spigots /[correction to diagram in (dB)]standard version highlighted

1 / [-2] 1 / [+3] 2 / [-2] 2 / [0] 2 / [+3] 2 / [+6] 3 / [+1]

Ø = 99 mm 1 / [-4] 1 / [0] 1 / [+5] 2 / [-2] 2 / [0] 2 / [+3] 2 / [+5]

Ø = 124 mm 1 / [-5] 1 / [-3] 1 / [+1] 1 / [+4] 1 / [+7] 2 / [0] 2 / [+1]

LDB 12/8/2, example: 130 m3/hm


Ø = 79 mmno. of spigots /[correction to diagram in (dB)]standard version highlighted

1 /[+1] 2 / [-3] 2 / [-1] 2 / [+2] 3 / [-2] 3 / [0] 3 / [+2]

Ø = 99 mm 1 /[-2] 1 / [+2] 2 / [-2] 2 / [-1] 2 / [0] 2 / [+3] 3 / [-1]

Ø = 124 mm 1 / [-3] 1 / [-2] 1 / [0] 2 / [-3] 2 / [-3] 2 / [-1] 2 / [-1]

Ø = 139 mm 1 / [-3] 1 / [-3] 1 / [-1] 1 / [+2] 2 / [-3] 2 / [-2] 2 / [-2]




1 / [+4] 2 / [0] 2 / [+4] 3 / [+2] 3 / [+4] 4 / [+3] 4 / [+4]

Ø = 124 mm 1 / [0] 1 / [+5] 2 / [0] 2 / [+2] 2 / [+5] 3 / [+2] 3 / [+3]

Ø = 139 mm 1 / [-1] 1 / [+2] 1 / [+6] 2 / [0] 2 / [+2] 2 / [+4] 3 / [+1]

Ø = 159 mm 1 / [-1] 1 / [0] 1 / [+1] 1 / [+3] 2 / [0] 2 / [+1] 2 / [+1]

Example: LWA = LWA (out of diagram in page 9) + [correction value],LDB 12/8/3, length 1500 mm, 2 x Ø 139, LWA = 27 dB(A) + 2 dB = 29 dB(A)




Technical brochure • Linear air diffusers LDBType LDB 12/8 and LDB 12/M, LTG System cleanR - accessories

Various border and additional profiles are available forLTG linear diffusers series LDB and LDB LTG SystemcleanR ensuring a perfect integration in and adaptationtoall kindsof ceiling systems. Thus, both an inconspicous

installation of the diffuser and its use as an interior design element are possible. Profiles may also be used incombination with each other.

Border profiles for type LDB 12/8 LTG System clean® (more border profiles see page 14)

Border profile for installation in ceiling joints (max. length 1250 mm)

LDB 12/8/1/55 LDB 12/8/2/55 LDB 12/8/3/55

Border profile for combination with additional profiles

LDB 12/8/1/00 LDB 12/8/2/00 LDB 12/8/3/00Border profile for covering ceiling joints

LDB 12/8/1/88 LDB 12/8/2/88 LDB 12/8/3/88Border profile for covering ceiling joints

LDB 12/8/1/11 LDB 12/8/2/11 LDB 12/8/3/11

Border profiles for type LDB 12/M LTG System cleanR


41

27

72 103

LDB 12/M/1/00 LDB 12/M/2/00 LDB 12/M/3/00Border profile for covering ceiling joints

48

271,5

79 110

LDB 12/M/1/88 LDB 12/M/2/88 LDB 12/M/3/88Border profile for covering ceiling joints

129

LDB 12/M/3/11

Additional profiles for type LDB 12/8 and 12/M, LTG System cleanR

Additional profile 2 Additional profile 7 (installation adjacent to lamps)

LDB 12/8/1/00/22 LDB 12/8/1/00/7-




Technical brochure • Linear air diffusers LDBType LDB 12/8 and 12/M, LTG System clean® - with sound absorber

Insertion loss / end reflection factorThe cross-talk sound transmission via air ducts betweenadjacent rooms is a sound flanking path which might reduce the sound insulation of partition walls or suspendedceilings.

DIN 4109 or customer agreements set minimum soundinsulation requirements for partition walls in terms of aweighted sound reduction index R'w.

Sound insulation indicesmay be calculated in terms of asound pressure level difference with known ceiling surface S and the equivalent absorption surface A of the receiving room:

L = R L- 10 lg (S/A)

When assessing the sound pressure level difference inthe air duct between the source and receiving room, calculation must be in the frequency bands (compareVDI 2081, Pages 1, 2, and LTG selection program). Therefore, for cross-talk sound absorbersmanufacturers' frequency-dependent insertion loss indices will have to beused. For air diffusers, the insertion loss/end reflectionof the air diffusers according to DIN EN ISO 7235 is decisive.

The following decision must be made:

1. no cross-talk sound absorber required

2. soundabsorber integrated in theair diffuser required

3. additional packaged attenuator of length x required

Through loss data of the air diffusers are determined asfollows:

Dt = Di + Dtd

Di air diffuser insertion loss index

Dtd theoretical end reflection at the open end of astraight, solid duct (duct end reflection) fromequation B3 in DIN EN ISO 7235

Insertion loss /end reflection factor Dt

Octave[Hz]

Dt without sound trap[dB]

LDB12/8/1

LDB12/8/2

LDB12/8/3

LDB12/8/4

63 25 22 19 21

125 16 17 14 15

250 8 6 7 5

500 12 8 8 8

1000 12 7 9 7

2000 9 5 5 4

4000 6 5 6 5

8000 6 5 4 4

Octave[Hz]

Dt with sound trap[dB]

LDB12/8/1

LDB12/8/2

LDB12/8/3

LDB12/8/4

63 25 22 19 21

125 16 17 14 15

250 18 12 11 9

500 22 18 16 15

1000 24 19 15 13

2000 19 15 12 10

4000 20 13 13 11

8000 18 11 11 9

Dimensions air distribution box with sound absorber (melamine resin foam)

LDB 12/8/1/00with air distribution boxand throttling device DLU

180

60

132 60

40.6

240

d/2+10

Ød


60

Ød

240

d/2+10

71.6

132

60180


60

Ød

240

d/2+10

102.6

162

180

60


60

Ød

240

d/2+10

192

180

60

134




Technical brochure • Linear air diffusers LDBType LDB 20/8 - Selection

Selection diagram

20 40 60 80 100

5

10

15

20

50

200

0.512Δp

[Pa]

10

20

10

H = 2.8 m

h = 1.7 m

- 10

∆t [K]

- 6

4030

20 30 40 50 60 80 100 200

15

20

25

30

-10∆t [K]

LDB 20/8/1 ./8/2

- 6

10

20

H = 2.8 m

h = 1.7 m

∆t [K]

- 6

- 3

- 3

- 3

35

- 8

a (cmax) [m]

V [m3 /(hm)]

- 10

LDB 20/8/3 and ./8/4

300

300

with undisturbed air diffusion


c max[cm/s]

a(cmax) cmax

LegendV = volume flow rate [m3/(hm)]tzu = supply air temperature [C]tRA = room air temperature [C]Δt = temperature difference




h = height of measuring point [m]H = room height [m]

The recommended min. distance between two paralleldiffusers should, in case of high temperature differencest, not be less than the value of a(cmax).The diagrams are based on measuring results with thestandard diffuser element adjustment and a roomheightof 2.8 m.


Volume flow rate per meter of diffuser:V = 90 m3/(hm)Resulting data for type LDB 20/8/1:Δp = 10 PaLWA = 28 dB(A)Δt = -10 Ka(cmax)≈ 1.4 mcmax ≤ 18 cm/s




Technical brochure • Linear air diffusers LDBType LDB 20/8 - dimensions

Air distribution boxesØd

61

d/2

+10

210

60

145

65 LDB

20/8/1/00

*

Ød

61

d/2

+10

265

60

LDB20/8/2/00

*

Ød

92

d/2

+10

250

60

LDB20/8/3/00

*

LDB20/8/4/00

Ød

123

d/2

+10

235

60

*

Air distribution boxes with insulation (double skin box)

91 45

Ød

d/2

+10

225

64

15 15

15

LDB20/8/1/00

*

Ød

91

280

4515

15 15

d/2

+10

67

LDB20/8/2/00

*

Ød

122265

45

15 15

d/2

+10

67

15

LDB20/8/3/00

*

Ød

153

250

45

15 15

d/2

+10

67D

15

LDB20/8/4/00

*

* Execution: integrated throttle damper DLU at spigot diameters 99 ... 139The values given refer to standard versions.Reduced box sizes and spigot diameters are available on request, depending on volume flow rate and acoustic requirements.D For the double skin box LDB 20/8/4 and a spigot diameter of 160, it is 52 mm instead of 67 mm

Spigot dimensions

Diffuser length Lnom [mm] 500 750 1000 1250 1500 1750 2000The given values LWA refer only to the execution without throttle damper resp. with throttle damper open.LDB 20/8/1, example: 90 m3/hm

LWA in dB(A) out of diagr. p. 15 (ref. to Lnom) 26 28 29 30 31 31 32


1 / [+1] 2 / [0] 2 / [+1] 2 / [+2] 3 / [0] 3 / [+2] 4 / [+1]

Ø = 99 mm 1 / [0] 1 / [+2] 2 / [0] 2 / [+1] 2 / [+1] 2 / [+1] 3 / [+1]

Ø = 124 mm 1 / [0] 1 / [0] 1 / [+2] 2 / [0] 2 / [0] 2 / [+2] 2 / [+2]




1 / [+1] 2 / [-2] 2 / [0] 3 / [-2] 3 / [-1] 3 / [+1] 4 / [-1]

Ø = 99 mm 1 / [-1] 2 / [-3] 2 / [-2] 2 / [-1] 3 / [-2] 3 / [-1] 3 / [-1]

Ø = 124 mm 1 / [-2] 1 / [-2] 1 / [+1] 2 / [-2] 2 / [-2] 2 / [-1] 2 / [0]

Ø = 139 mm 1 / [-2] 1 / [-2] 1 / [0] 2 / [-2] 2 / [-2] 2 / [-1] 2 / [-1]




1 / [+1] 2 / [-4] 2 / [+1] 3 / [-2] 3 / [+1] 4 / [-1] 4 / [+1]

Ø = 124 mm 1 / [-5] 1 / [+2] 2 / [-5] 2 / [-2] 2 / [+2] 3 / [-2] 3 / [0]

Ø = 139 mm 1 / [-6] 1 / [-2] 1 / [+3] 2 / [-4] 2 / [-2] 2 / [+1] 3 / [-4]

Ø = 159 mm 1 / [-7] 1 / [-6] 1 / [-3] 1 / [0] 2 / [-6] 2 / [-4] 2 / [-3]




1 / [+1] 2 / [-1] 2 / [+1] 3 / [0] 3 / [+1] 4 / [0] 4 / [+1]

Ø = 139 mm 1 / [0] 1 / [+3] 2 / [0] 2 / [+1] 3 / [-1] 3 / [+1] 4 / [0]

Ø = 159 mm 1 / [-1] 1 / [0] 1 / [+2] 2 / [-1] 2 / [0] 2 / [+1] 3 / [-1]

Example: LWA = LWA (out of diagram in page 15) + [correction value],LDB 20/8/2, length = 1000 mm, 2 x Ø 99, LWA = 30 dB(A) - 2 dB = 28 dB(A)




Technical brochure • Linear air diffusers LDBType LDB 20/8 - additional profiles, border profiles

Various border and additional profiles are available forLTG linear diffusers type LDB and LDB LTG SystemcleanR ensuring a perfect integration in and adaptation

to all kinds of ceiling systems. Thus, both an inconspicuous installation of the diffuser and its use as an interiordesign element are possible. Profilesmay alsobe used incombination with each other.

Additional profiles

Additional profile 2 Additional profile 7 (installation adjacent to lamps)

LDB 20/8/1/00/22 LDB 20/8/1/00/7-

Border profiles

Border profile for installation in ceiling joints

LDB 20/8/1/55 LDB 20/8/2/55 LDB 20/8/3/55 LDB 20/8/4/55


LDB 20/8/1/00 LDB 20/8/2/00 LDB 20/8/3/00 LDB 20/8/4/00

Border profile for covering ceiling joints

LDB 20/8/1/88 LDB 20/8/2/88 LDB 20/8/3/88 LDB 20/8/4/88

Border profile for covering ceiling joints

LDB 20/8/1/11 LDB 20/8/2/11 LDB 20/8/3/11 LDB 20/8/4/11

Border profile for ceiling panels and adjacent to lamps

LDB 20/8/1/44 LDB 20/8/2/44 LDB 20/8/3/44 LDB 20/8/4/44

Border profile for ceiling panels

LDB 20/8/1/22 LDB 20/8/2/22 LDB 20/8/3/22 LDB 20/8/4/22




Technical brochure • Linear air diffusers LDBType LDB 20/8 - with sound absorber

Insertion loss / end reflection factorThe cross-talk sound transmission via air ducts betweenadjacent rooms is a sound flanking path which might reduce the sound insulation of partition walls or suspendedceilings.

DIN 4109 or customer agreements set minimum soundinsulation requirements for partition walls in terms of aweighted sound reduction index R'w.

Sound insulation indicesmay be calculated in terms of asound pressure level difference with known ceiling surface S and the equivalent absorption surface A of the receiving room:

ΔL = RL- 10 lg (S/A)

When assessing the sound pressure level difference inthe air duct between the source and receiving room, calculation must be in the frequency bands (compareVDI 2081, pages 1, 2, and LTG selection program). Therefore, for cross-talk sound absorbersmanufacturers' frequency-dependent insertion loss indices will have to beused. For air diffusers, the insertion loss/end reflectionof the air diffusers according to DIN EN ISO 7235 is decisive.

The following decision must be made:

1. no cross-talk sound absorber required

2. soundabsorber integrated in theair diffuser required

3. additional packaged attenuator of length x required

Through loss data of the air diffusers are determined asfollows:

Dt = Di + Dtd

Di air diffuser insertion loss index

Dtd theoretical end reflection at the open end of astraight, solid duct (duct end reflection) fromequation B3 in DIN EN ISO 7235

Insertion loss / end reflection factor Dt

Octave[Hz]

dt without sound trap[dB]

LDB20/8/1

LDB20/8/2

LDB20/8/3

LDB20/8/4

63 25 22 19 21

125 16 17 14 15

250 8 6 7 5

500 12 8 8 8

1000 12 7 9 7

2000 9 5 5 4

4000 6 5 6 5

8000 6 5 4 4

Octave[Hz]

Dt with sound trap[dB]

LDB20/8/1

LDB20/8/2

LDB20/8/3

LDB20/8/4

63 25 22 19 21

125 16 17 14 15

250 18 12 11 9

500 22 18 16 15

1000 24 19 15 13

2000 19 15 12 10

4000 20 13 13 11

8000 18 11 11 9

Dimensions air distribution box with sound absorber (melamine resin foam)


132 60

d/2+10

180

240

60

ød


60

ød

240

d/2+10

180

60

132


60

ød

240

d/2+10

60180

162


60

ød

240

d/2+10

60180

192




Technical brochure • Linear air diffusers LDBType LDB 12 and LDB 15 LTG System clean® – selection

Selection diagram

20 40 60 80 100

5

10

15

20

50

200

0,512

10

20

H = 2,8 m

h = 1,7 m

- 10

- 6

4030

20 30 40 50 60 80 100 200

15

20

25

30

35

-10∆t [K]

LDB 12

- 6

- 3

- 3with undisturbed air diffusion

10

20

H = 2,8 m

h = 1,7 m

- 10

∆t [K]

LDB 15

- 6


-12

a (cmax) [m]

V [m3/(hm)]

- 3

- 12

- 12

............... = dimensioning area beyond LTG System clean®

300

300

c max[cm/s] ∆t [K]

∆p [Pa]

a(cmax) cmax

Legend






Note: The recommended min. distance between twoparallel diffusers should, in case of high temperaturedifferences Δt, not be less than the value of a (cmax).

The diagrams are based on measuring results with thestandard diffuser element adjustment and a roomheightof 2.8 m.


Volume flow rate per meter of diffuser:V = 60 m3/(hm)

Resulting data for type LDB 15/-/1:Δp = 10 PaLWA = 25 dB(A)Δt = -10 Ka(cmax)≈ 1 mcmax ≤ 15 cm/s




Technical brochure • Linear air diffusers LDBType LDB 12 - dimensions and accessories border profiles

Air distribution box without insulation Air distribution box with insulation (double skin box)

96

121

15

45126

151

LDB 12/-/1/00 LDB 12/-/1/00

The values given refer to standard versions. Reduced box sizes and spigot diameters are available on request, depending on volumeflow rate and acoustic requirements. *) Neck lengths 45 to 80 mmSpecial dimensions on request.

Spigot dimensions Diffuser length Lnom [mm]* 500 750 1000 1250

LDB 12 Ø d [mm] 1 x 99 1 x 99 1 x 99 2 x 99

Border profiles (length max. 1250 mm)

LDB 12/-/1/00

Profile for inconspicuous installation inshaded joints

Profile for covering ceiling joints

Profile for lamps, suitable for lampborders of 6...7 mm

LDB 12/-/1/11

LDB 12/-/1/20




Technical brochure • Linear air diffusers LDBType LDB 15 LTG System cleanR - dimensions, border profiles

Air distribution box without insulation Air distribution box with insulation (double skin box)

96

121

126

15

45

151

LDB 15/0/1/00 LDB 15/0/1/00

The values given refer to standard versions. Reduced box sizes and spigot diameters are available on request, depending on volumeflow rate and acoustic requirements. *) Neck lengths 45 ... 80 mm

Spigot dimensions Length of diffuser LNom [mm]* 500 750 1000 1250 1500 1750 2000

LDB 15 Ø d [mm] 1x99 1x99 1x99 2x99 2x99 2x99 2x99

Border profiles

LDB 15/0/1/00Profile for inconspicuous installation inshaded joints

LDB 15/1/1/11 Profile for covering ceiling joints

LDB 15/0/1/20Profile for lamps, suitable for lampborders of 6...7 mm




Technical brochure • Linear air diffusers LDBType LDB 50 - selection

Selection diagram

200 400

5

10

15

20

50

800

11.524

Δp

[Pa]

10

20

H = 5 m

h = 1.7 m

- 10∆t [K]

- 6

4030

20

25

30

-10∆t [K]

LDB 50/-/1

- 6

10

20 H = 5 m

h = 1.7 m

35

300100 600

200 400 800300 600100

40

45

5 3

11,5245 3

- 8- 6 LDB 50/-/2

amin [m]

V [m3 /(hm)]

∆t [K] LDB 50/-/3- 6

- 4

- 4



1200

1200

a (cmax) [m]

c max[cm/s]

a(cmax) cmax

Legend






Note: The recommendedmin. distance between two parallel diffusers should, in case of high temperature differences Δt, not be less than the value of a (cmax).

The diagrams are based on measuring results with thestandard diffuser element adjustment, a room height of5m and a uniform load distribution. For an optimized airflow, an adaptationmaybe requiredaccording toproject.


Volume flow rate per meter of diffuser:V = 360 m3/(hm)Resulting data for type LDB 50/-/1:Δp = 26 PaLWA = 41 dB(A)Δt = -10 Ka(cmax)≈ 4.4 mcmax ≤ 24 cm/s




Technical brochure • Linear air diffusers LDBType LDB 50 - dimensions, additional profile

Dimensions of air distribution boxes

201

241

201

241

321

241

LDB 50/–/1/00 LDB 50/–/2/00 LDB 50/–3/00

Dimensions of air distribution boxes with insulation (double skin box)

231

326

201

241

1545 231

326

201

241

1545 351

326

321241

1545

LDB 50/–/1/00 LDB 50/–/2/00 LDB 50/–/3/00

The values given refer to standard versions. Reduced box sizes and spigot diameters are available on request, depending on volumeflow rate and acoustic requirements. *) Neck length 70 ... 170 mm

Spigot dimensions Additional profile

Diffuser length Lnom[mm]*

300 600 900 1200 1500 1800 2100

LDB 50/-/1(1 slot row)

Ø d1x199

1x199

2x199

2x199

3x199

3x199

3x199

LDB 50/-/2(2 slot rows)

Ø d1x199

1x199

2x199

2x199

3x199

3x199

4x199

LDB 50/-/3(3 slot rows)

Ø d1x199

1x199

2x199

2x199

3x199

3x199

4x199

*) We recommend to choose large spigot and duct diameters to obtain thelowest possible duct speed as this will result in lower pressure losses and lessnoise caused by the flow. Due to an improved air distribution, the system can dowithout some of the additional units usually required such as throttle valves.




Technical brochure • Linear air diffusers LDBInstallation

Distance between parallel linear diffusers and to wallsAn unfavorable arrangement of linear diffusers in parallel lines or close to walls may result in air flow speedshigher than those given in the technical specifications.

In order to avoid this problem:

- ensure that the distance between parallel linear diff-users is sufficiently large to exclude any interaction,

- ensure that air jets are mixed above the occupied zone(e.g. at a height of 1.8 m).

Based on these requirements, the two areas marked inFigure 1 are obtained indicating the recommended distance b between parallel linear diffusers.

For an installation parallel to walls, at least half the distance (b/2) is required.

b/2 b

0 0.5 1 1.5 2 2.5 3 3.5 40

1

2

3

4

5

6

Jet penetration depth a(cmax) [m]

Distance

b[m

]

Figure 1:Distance between parallel diffusers with a symmetric air flowpattern

Example

From theselection diagram: a(cmax) = 1.1 m

Recommended distancebetw. parallel diffusers: 1.1 m < b < 1.9 m or b > 2.9 m

recommended distanceto the wall: b/2 > 0.55 m

All linear diffusers also allow an asymmetric splitting ofthe air volume in a 1/3 to 2/3 ratio.

The recommended distances b1/3 and b2/3 betweenparallel diffusers are illustrated in Figure 2. For the jetpenetration depth a(cmax) refer to the selection diagramsfor a symmetric distribution.

0 0.5 1 1.5 2 2.5 30

1

2

3

4

5

0

2

4

6

8

10

Distance

b1/3

[m]

Distance

b2/3

[m]

Jet penetration depth a(cmax) [m]

b1/3/2 b2/3 b1/3 b2/3/2

Figure 2:Distance between parallel diffusers with an asymmetric airflow pattern (1/3 to 2/3).

Example

From theselection diagram: a(cmax) = 1.1 m

Recommended distancebetween parallel diffusers:1/3-share: 0.8 m < b1/3 < 1.4 m or b1/3 > 2.4 m2/3-share: 1.6 m < b2/3 < 2.8 m or b2/3 > 4.8 m

Recommended distanceto the wall:1/3-share: b1/3/2 > 0.4 m2/3-share: b2/3/2 > 0.8 m




Technical brochure • Linear air diffusers LDBAccessories - throttling device type DLU

Pressure drop and acoustic level DLU Ø 99

Flow rate [m3/h]

Additionalstaticpress

ure

drop[Pa]

40 60 80 100 120 140 160 1802002

4

6810

20

40

6080100

200

20

25

30

40

35

90°

45°

60°

75°


2

4

6810

20

40

6080100

200

Flow rate [m3/h]

60 80 100 120 140 160 180 200 220240

90°

45°

60°

75°

2025

30

40

35


ure

drop[Pa]

The throttle damper type DLU consistsof a damper blade out of galvanizessteel sheet, integrated in the air distribution box. It is adjustable through thediffuser.

For an acoustic dimensioning, thesound sources must be summedlogarithmically when using thrott-ling devices in combination withlinear diffusers.


2

4

6810

20

40

6080100

200

Flow rate [m3/h]

80 100 120 140 160 180 220 240

90°

45°

60°

75°

20

25

30

40

35

200


ure

drop[Pa]




Technical brochure • Linear air diffusers LDBAccessories - throttling devices type KLA and KLU

* other dimensions on request

2 x d *

Ød

41

61

d/2

+10

210

2 x d *

Ød

41

61

d/2

+10

210

Type KLA, Type KLU,adjustable from outside the duct adjustable through the diffuser

The throttling damper typeKLAandKLUare manually adjustable devices forconnection to the air distribution box.The damper blades are made ofperforated plate available with variousfree areas to suit throttlingrequirements. Type KLA is adjustablefrom outside the duct on the pivotspindle. Type KLU is adjustable throughthe diffuser.

For an acoustic dimensioning, thesound sources must be summed logarithmically when using throttling devices in combination with linear diffusers.

Pressure drop and acoustic level KLA, KLU

0.3 0.5 1 1.5 2 3 4 52

5

10

20

50

100

200

10 20 30 40 50 60 70 80 100 120

Ø d 139

Ø d 199

20 30 40 50 60 70 80 100 120 160 200Ø d 124

30 40 50 60 80 100 125 150 200 300 350Ø d 159

20 30 40 50 60 80 100 120 160 200 250

40 60 80 100 125 150 200 250 300 400 550

Ø d 99

+ 2 dB

+ 3 dB

+ 6 dB

+ 4 dB

90°/55°

60°/40°

45°/30°

30°/20°

Air velocity within spigot [m/s]

Flow rate [ m3/h]

Sound power level +/- 3 dB


ure

drop[Pa]

15

35

30

25

20

40




Technical brochure • Linear air diffusers LDBAccessories for installation of lamps

LTG has developed special border profiles for theapplication of linear diffusers in combination with lamps.Awide variety of lampbrandsandstyles can beusedwiththe linear diffusers. The installation of the diffuser isperformed by screw connections. In order to make the

installation even easier, the components are standard,which means that no drilling or adjusting of the lineardiffusers will be required to fit the lamps.Alternatively, the lamps may be integrated in the airdistribution box by using a lamp rail.

LTG linear diffuserstype LDB 12/8/2/12 witha lamp rail integrated inthe air distribution box.

Example for lamp installation using LDB 12/–/1/20

Example for lamp installation using LDB 12/8/1/40/-7

Example for lamp installation, suitable for the followinglinear diffuser types:LDB 12/-/1/20LDB 15/0/1/20LDB 12/8/1/40/-7LDB 20/8/1/40/-7




Technical brochure • Linear air diffusers LDBAccessories for suspension

Ø 5

Example for installation of typeLDB 12/8/1/00 with air distribution boxand subsequently “second fix” installedslotted rail

Example for installation of typeLDB 20/8/1/00 with air distribution boxand continuously adjustable springhanger (adjusting range about 3/4 of thelength of the hooked wire)

Example for installation of typeLDB 20/8/2/00 with air distribution boxwithout insulation.The four suspension eyes are includedin the delivery of the narrow box.

11462

90111151

43 57

30

Ø 7

41

50

oblong holes 12.5 x 5

31

17

Example for installationof type LDB 20/8/3/11with fixing brackets for blind attachment

Example for installationof type LDB 20/8/1/00with suspension bracket for blindattachment

Example for installationof blind profiles type LDB 15





Accessories for installation

End capsBy using end caps, a closed frame of linear diffusers is obtained.

25*

1.567

41

17

41

Example:LDB 20/8/1/11 with end cup

Example:LDB 20/8/1/00 with support bracket

Example:LDB 20/8/1/00 with end plate

LDB 20: 15 or 25 mm*LDB 50: 20 mm

LDB 12/8 and 20/8: 4.5 mmLDB 50: 6 mm

* 15mm for border profile 8.25mm for border profile 1

2

4

17

Adjustable

height

asrequired

3

Connecting pieceA flush mounting of the diffusers is achieved by usingconnecting pieces inserted in the guiding grooves of theprofiles.Several linear diffusers may thus be connected to forma continuous line.For linear diffusers with additional profiles, a flushmounting is achievedby using additional overlapprofilesor connecting pins.

Connecting pin when usingadditional profiles

Connecting piece (not possible whenusing additional profiles)

AngleAnglesoffer a perfect solution for the continuous installation of linear diffusers.

L ± 0,5

L±0,5

Angle, Lmin = 250 mm

Displacement in height ± 0.5 mm




Technical brochure • Linear air diffusers LDBNomenclature, ordering code

LDB 20/8 / 1 / 00 / 1 / E6 EV1 / 2000 / S20 / S / EWB / S / – / SDA / O / B / M(1) (2) (3) (4) (5) (6) (7) (8) (9) (10) (11) (12) (13) (14) (15) (16)

(1) Diffuser type LDB 12/ = LDB 12/LDB 12/8 = LDB 12/8LDB 12/M = LDB 12/MLDB 20/8 = LDB 20/8LDB 15 = LDB 15LDB 50 = LDB 50

(2) Number of slots 1...4 = 1…4 slotsLDB 12 / LDB 15 only 1 slot, LDB 12/M only 1…3 slots

(3) Design border profile 0...8 = Left - right(4) Design additional profile – = Without

1, 7 = Left - right(5) Surface additional profile E6 = Anodized, unbrushed

LG = Painted, glossyLM = Painted, matR = UnfinishedX = Special finishB = Coated

(6) Colour border profile .... = RAL-shade = painted... = Anodizing shade = anodized

(7) Diffuser length .... = Diffuser length in mm(8) Flow pattern S12 = 2R2L, ... (for LDB 12/, LDB 12/8, LDB 12/M)

S20 = 3R3L, ...S15 = 3R3L3R, 3L3R3L, ...S50 = 3R3L, ...SX = ... (special version)

(9) Diffuser element colour S = RAL 9011 graphite blackW = RAL 9010 pure whiteG = RAL 9007 grey aluminiumX = RAL .... (special colour, indicate RAL-shade)

(10) End caps – = WithoutEWB = End caps both sidesEWR = End caps right sideEWL = End caps left sideEPB = End plat both sidesEPR = End plate right sideEPL = End plate left side

(11) Plenum box type – = WithoutS = Standard plenum boxD = Double skin plenum boxX = Special plenum boxW = Angle

(12) Sound absorber – = Without sound absorber

S = With sound absorber(13) Connection type – = Without

SDA = Spigot onlyDLU = Throttling device DLUKLA = Throttling device KLAKLU = Throttling device KLU

(14) Diffuser element type O = OpenB = Blind

(15) Suspension for dummydiffuser installation

O = WithoutB = Suspension bracketsDB = Double dummy brackets

(16) Second fix O = Without Second Fix fixingM = With Second Fix fixing

Note: Not all combinations are practicable. In individual cases please contact LTG. 1.Dient zur Identifizierung der letzten Seite



Product OverviewLTG Air Diffusers

Custom diffusers

LDR and LDB 12M LTG System clean

Step diffuser BLQ

Displacement air diffuser DLD

Displacement air diffuser DLQ

LTG air diffusers for ceiling, wall or floor

Lineardiffuser

LDB LDK-B LDU

LDB LTG System clean LDK-B LTG System clean LDU-W

Swirl-diffuser

DLA

Transfer airdevice

LDO- T

Ceiling Wall Floor

Engineering Services

LTG Engineering Services Comfort Air Technology




Grenzstraße 7

70435 Stuttgart

Germany

Tel.: +49 (711) 8201-0

Fax: +49 (711) 8201-720

E-Mail: [email protected]

www.LTG-AG.com

LTG Incorporated

105 Corporate Drive, Suite E

Spartanburg, SC 29303

USA

Tel..: +1 (864) 599-6340

Fax: +1 (864) 599-6344

E-Mail: [email protected]

www.LTG-INC.net

LDB-eng-TP (10/14) 419-16E LTG Aktiengesellschaft • Former editions are invalid • Subject to technical modifications

Comfort Air Technology

Air-Water Systems

Air Diffusers

Air Distribution

Process Air Technology

Fans

Filtration technology

Humidification Technology

Engineering Services

Air flow tests

Thermodynamics

Acoustics / Comfort

Customised solutions

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