AIRFOILCENTRIFUGAL

FANS

DESI

GN

10A

Bulletin ACF 103

Quieter,

More Efficient

Airfoil Fans for

Commercial and

Light Industrial

Applications

CHICAGO QUALITY

Design 10A fans are built under Chicago Blower’s strict “Industrial Quality”standards, the same standards as those used on Chicago’s custom engi-neered fans, to assure exceptional performance and reliability. Design 10Aairfoil fans feature rugged heavy gauge housings and continuously weldedscrolls. From material inspection to plasma cutting to assembly, every stepis governed by stringent quality procedures.

Fourteen Sizes to 80"

Volumes to 284,000 CFM

Pressures to 13" WG

Arrangements 1, 3, 9

Construction Classes I, II, III

Single and Double Width

Chicago Blower representatives arelocated throughout North Americaand around the world. For applica-tion assistance, the Chicago represen-tatives will help evaluate your needsand provide recommendations.We want you toenjoy doingbusiness withChicago Blower.

Design10AFans withAirfoil Wheels

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Chicago’s Design 10A is a ruggedmulti-purpose centrifugal fan equip-ped with an airfoil wheel suited forsupply and exhaust air and lightduty industrial applications. Withenergy efficient airfoil blades, theDesign 10A fan provides reliableand quiet operation, even in mildlycontaminated air. The fan is also suit-ed for high temperature airstreams.

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Chicago Blower’s wheels feature air-foil blades continuously welded to astreamlined wheel cone and heavysteel backplate. The hollow bladeshave weep holes to prevent mois-ture build-up inside the blade.

Airfoil wheels have true non-over-loading horsepower characteristics,mechanical efficiency over 80% anda steep stable pressure curve, idealfor applications with pressure varia-tions. Should actual system pressure

Chicago Blower Corporation certifiesthat the Design 10A Fans shown or here-in are licensed to bear the AMCA Seal.The ratings shown are based on testsand procedures performed in accordancewith AMCA Publication 211 and complywith the requirements of the AMCACertified Ratings Program.

DESI

GN

10A

Exceptional AirfoilPerformance

D/10AFans forEveryDuty

Chicago’s D/10A airfoil fans are available standard inthree construction classes to meet every applicationrequirement. All classes feature heavy gauge housingsand continuously welded scroll. Class II adds additionalbracing in the larger sizes. Class III adds heavier shaftsand bearings, and wheels reinforced with a stiffenerring to withstand higher pressure.

Wide Fan Selection

Arrangement I

Arrangement 3

Arrangement 9

Arrangement 3

40" - 80"

40" - 80"

40" - 80"

40" - 80"

22" - 66"

30" - 60"

22" - 49"

30" - 60"

SISW

DIDW

CLASS I & IIFAN SIZES

CLASS IIIFAN SIZES

Chicago’s D10A airfoil fans are offered in Single InletSingle Width arrangements 1, 3 and 9; Double InletDouble Width in arrangement 3. Sizes 60 and largerare standard with septagonal housings for additionalstrength and stability.

reach 30% higher than the pressureanticipated, the Design 10A wouldstill deliver 90% of the originaldesign volume.

Chicago’s airfoil is not only the mostenergy efficient wheel type, it pro-vides the quietest operation. Fansare rated for temperatures to 800°when used with a shaft cooler andshaft seal. All of Chicago’s D/10Afans exceed AMCA performancestandards.

IINLETVOLUMECONTROLWhen the fan is used for varying or partial load applications, theInlet Volume Control (IVC) providesprecise air control and more effi-cient operation. Adjustable guidevanes pre-spin the incoming air inthe same rotation as the wheel toproduce the desired volume of airat the exact pressure.

Vanes are mounted entirely withinthe inlet cone. Automatic control isachieved by adding an electric orpneumatic actuator. The IVC is suit-able for manual operation to 650°Fand automatic operation to 350°F.

OUTLET DAMPERSDampers offer an economicalalternative to IVCs. However, theyrequire substantially more horse-power at reduced air volume.Dampers for all fan classes havedouble thickness airfoil blades,and are available with parallel oropposed blade rotating louvres.

Dampers have punched flangeson both ends and are suitable formanual or automatic operation. Amatching punched flanged outletis required for mounting. Alternateconstruction is available for dirtyor high temperature applications.

PUNCHED FLANGEDINLET/OUTLETFormed ring inlet is punched forinlet duct connection. Heavyangle flange can be welded to the outlet, either punched or unpunched.

SHAFT AND BEARING GUARDThe expanded metal guard encloses the shaft and bearings. For easier lubrication, extendedgrease fittings are recommended.

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SHAFT COOLER AND GUARDCast aluminum cooling wheel withexpanded metal guard raises theallowable temperature limit forarrangement 1 or 9 fans from 300°Fto 650°F. Adding a shaft seal on ar-rangement 1 fans extends the limitto 800°F. Refer to page 6 for hightemperature/RPM deration factors.

SHAFT SEALA non-contact seal mountedbetween steel plates reduces leak-age through the shaft opening inthe housing.

INLET BOXThe bolt-on inlet box simplifies ductwork connection when astraight horizontal connection isnot feasible. Assures dependablefan performance when a sharp turn is requiredat the fan inlet.

Performance Options

Chicago’sfan.netComputerSelectionProgram

SPARK RESISTANT CONSTRUCTION AMCA Type C spark resistant con-struction substitutes an aluminuminlet cone and adds a drive side aluminum buffing tube betweenthe wheel, shaft and housing.Maximum temperature is 600°F.Not available when the fan isequipped with an IVC.

UNITARY BASEFan and adjustable motor base are welded onto a unitary base of continuously welded structuralsteel channel.

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For performance, fan curves andsound data, refer to Chicago Blower’sfan.net computer selection program.

For software and assistance, contact your local Chicago Blowersales engineer.

INLET COLLAR

INLET SCREEN

BELT GUARD

FLUSH MOUNT& PLUG TYPEACCESS DOORS

HOUSING DRAIN

CORROSION RESISTANT COATING

SPLIT HOUSINGS

EXTENDED GREASE FITTINGS

Additional Options D

ESI

GN

10A

EngineeringSpecifications

Design 10AFans withAirfoilWheels

GENERAL:Provide a high performance, low mainte-

nance, centrifugal fan with airfoil wheel and

hyperbolic wheel cone. Fan shall be licensed

to bear the AMCA Certified Ratings Seal for Air

Performance based on tests and procedures

in accordance with AMCA standard 211. Fans

must be manufactured and assembled in the

U.S.A. Acceptable vendors: Chicago Blower

Corporation

PERFORMANCE:Performance shall include steep pressure and

non-overloading horsepower characteristics.

Mechanical efficiency shall be no less than

80%. Wheel inlet cone to be designed to

ensure smooth, stable air flow across the

entire operating range. System static pressure

changes of 30% shall result in an approximate

10% volume reduction.

HOUSING:Fan housing shall be of welded, heavy gauge

construction with seven common discharge

positions. Scroll is to be continuously welded.

ROTOR:Wheel shall have cast iron hub (steel hub on

sizes 40-1/4, 44-1/2 and 49) lock bolted to a

heavy backplate. Airfoil blades continuously

welded to the backplate and hyperbolic

wheel cone. Wheels to be statically and

dynamically balanced to G 6.3 standards in

accordance with ISO 1940 and ANSI S2.19

specifications. Shaft shall be turned, ground

and polished 1045 hot rolled steel straight-

ened to a maximum T.I.R. of .002 inches

and mounted using heavy duty ball or roller

pillow block bearings. Shaft critical speed shall

not be less than 1.25 times maximum RPM.

MOUNTING:Housing and base assembly complete with

integral mounting angles for connection to

foundation. Adjustable motor base to be

welded to base or channel.

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FACTORY MOUNTEDMOTORS AND DRIVES(Accessory)Motors and drives to be factory mounted.

Unit to be tested at running speed for vibra-

tion and balance. Filtered vibration readings,

taken at bearings, are not to exceed 0.15

inches per second.

INLET VOLUME CONTROL(Accessory)Inlet volume control (IVC) device shall be

totally enclosed within the inlet cone. IVC

device shall be 7-bladed, and pre-spin the

incoming air to control volume and pressure.

ACCESSORIES(Choose from the following)• Slip-fit Inlet

• Flanged Inlet or Outlet - Punched Holes

• Companion Flange - Punched orUnpunched - Inlet, Outlet or Both

• Type “C” AMCA Spark ResistantConstruction

• 1-1/2" NPT Housing Drain

• Shaft Seal

• Quick Clamp or Raised Bolted Access Door

• Inlet Screen

• Shaft Cooling Wheel with Guard(Required from 300 - 800°F)

• Adjustable Motor Base

• Shaft and Bearing Guard withExtended Grease Fittings

• Totally Enclosed Belt Guardwith Ventilation Panel

• Constant or Adjustable SpeedV-Belt Drives - minimum 1.2 S.F.

• Outlet Damper - Parallel or Opposed Blades.Manual Operation with Locking Quadrant.

• Unitary Base: Heavy channel construction,continuously welded, with fan and motorbase welded to insure vibration-free service.

• Inlet Box: Bolt-on with access door andoptions for support leg mounting and shopassembly.

COMPONENTS

Many system builders andOEMs specify Chicago airfoilcomponents for their pack-aged equipment. Componentsoffered include single anddouble width airfoil wheelsand housings, inlet cones in100% and 72% widths andInlet Volume Controls for vari-able volume systems. Specialfinishes and alternate materialsare available to suit specificinstallation requirements.

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ChicagoAirfoil Fansfor Every

Application

DESIGN 51AIRFOIL FANS

The D/51fan is especially suitedfor variable air volume systems.Wide selection of sizes from 135to 890, in four AMCA arrange-ments and three constructionclasses. Available in single widthand double width configurationsplus alternate RA Design 51 forlow pressure, high volume appli-cations. Ask for Bulletin DFOP.

SQA FANS

The SQA is the airfoil version ofChicago’s square fan family. Thefan is suited for supply air, cleanexhaust and high temperaturegasses to 650°. It is available asa “packaged” fan ready toinstall. Sizes range from 8-3/4 to44-1/2 with volumes to 55,600CFM and pressures to 15". Askfor Bulletin SQA.