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
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
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.
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
Adjustable Motor Base
Arrangement 9 bases are pre-punched for popular motor
frames, and feature threaded belt tension adjustment and
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.
Shaft & Bearing