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Airfoil Efficiency

SQA’s airfoil wheel provides higher wheel efficiency

along with reduced energy costs. SQA blades create a

smooth lifting airflow, requiring less horsepower to deliver

comparable air volume, with reduced noise levels.

Chicago Blower’s airfoil design provides a broad

efficiency curve which offers a wide range with more

selections for each fan size. The SQA with its steep

pressure characteristics is ideal for applications with

pressure variations.

AMCA

Certified

Chicago Blower Corporation

certifies that the Design 36 SQA

Airfoil Centrifugal Square Fans

shown herein are licensed to

bear the AMCA Seal. The ratings

shown are based on tests and

procedures performed in accor-

dance with AMCA Publication

211 and comply with the require-

ments of the AMCA Certified

Ratings Program.

Features

Rugged Construction

Heavy gauge steel housings are welded by AWS welders to

assure structural integrity with extended durability. Flanged

housing edges add to the fan’s exceptional rigidity.

Hyperbolic Wheel Cone

Chicago’s exclusive hyperbolic spun steel wheel cone opti-

mizes the smooth stable air flow across entire operating range.

Precision Shafts

Shafts made from SAE 1045 carbon steel are turned,

ground and polished to assure a tight bearing and hub fit.

They are also sized to operate at least 20% below the first

critical speed.

Adjustable Motor Base

Arrangement 9 bases are pre-punched for popular motor

frames, and feature threaded belt tension adjustment and

positive locking.

Flanged Outlet

All models are furnished with pre-punched flanged outlets

for solid connection to system ductwork and to match the

optional outlet damper.

Adjustable Discharge Positions

The housings are easily rotated without disassembly to

simplify installation and relocation while operating efficiently

in all four discharge positions.

3

Removable

Shaft & Bearing

Guards

Removable

Belt Guard

Cover

Adjustable

Motor Base

Precision

Shafts

Rugged

Steel Housing

Airfoil

Wheel

Inlet Cone

Slip Fit

Inlet

Flanged

Outlet