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Chicago Blower Corporation equipment is prepared for shipment in

accordance with the Uniform Freight Classification. It is thoroughly

inspected at the factory and, barring damage in transit, should be in good

condition upon arrival.

When a carrier signs Chicago Blower Corporation’s bill of lading, the

carrier accepts the responsibility

for any subsequent shortages or

damage evident or concealed, and

any claim must be made against

the carrier by the purchaser.

Evident shortage or

damage should be

noted on the carrier’s delivery document

before signature of accep-

tance. Inspection by the carrier of damage evident or concealed must be

requested. After inspection, issue a purchase order for necessary parts

or arrange for return of the equipment to Chicago Blower Corporation

factory for repair.

Chicago Blower fans are shipped skidded and may be handled and

moved using good rigging techniques, being careful to avoid concentrated

stresses that distort any of the parts.


If the fan is not to be installed promptly, store it in a dry place with the

motor and wheel protected against moisture, dust, corrosion and physi-

cal damage. If the unit must be exposed to weather, contact the Motor

manufacturer for special instructions. For long extended storage periods

call Chicago Blower for instructions.


The fan which you have purchased is a rotating piece of equipment and

can become a source of danger to life or cause injury if not properly

applied. The

maximum operating temperature



for which this

fan is designed

must not be exceeded.

These limits are given in our

catalog or on Chicago Blower Corporation drawings.Typically the airstream

temperature must not exceed 150°F., but with special consideration of

motor selection, may be able to operate up to 200°F

Personnel who will operate this fan, or those who will perform maintenance


must be given this bulletin to read and warned of the poten-

tial hazards of this equipment.

This pamphlet contains general recommendations, but specific require-

ments may apply to the individual installation. Such requirements are out-

lined in federal, state and local safety codes. Strict compliance with these

codes, and strict adherence to these installation instructions

are the

responsibility of the user.


1. Good results

require a proper foundation.

Foundations should be

level, rigid, and of sufficient mass for the equipment. Concrete

is preferable. Its mass should be at least four times the fan weight.

Adequately brace steel platforms in all directions. The minimum natur-

al frequency of any part must be at least 50% higher than the fan

running speed.

2. Shim the fan support points before tightening foundation bolts. Do not

distort or twist the equipment. Duct connections should be smooth

and straight. Elbows and other transitions should be located at least

five wheel diameters from fan inlet. Flexible connections should be

used at inlet and discharge. The fan should never support or restrain

any duct weight or force.

3. Make sure the power is locked “OFF”.

4. Check wheel-to-inlet clearance to make sure it has not shifted during

shipment or handling. There should be approximately equal axial

clearance all around and maintain an overlap of the inlet cone and

wheel. See Detail. Add “A” to the measured blade tip width for proper

set-up of inlet cone to inside of backplate. Rotate wheel by hand to

check that it runs free.


After installing the fan per these instructions and the instructions of the

manufacturers, make final safety checks to prevent injury to personnel or

damage to the equipment.

Always block rotating parts to prevent

windmilling while inspecting the fan.

1. Lock power source in “OFF” position

2. Make sure the wheel inside of the fan housing and any ductwork is

clean and free of debris.

3. If fan is equipped with optional Inlet Vane Control (IVC), check IVC

handle location. See Detail. Handle may have been rotated out of posi-

tion for shipping purposes. Loosen locknut, rotate handle to position

shown on assembly drawing and tighten locknut.

Note: The pivot bolt

must be installed to allow free movement of the IVC operating han-


Note: Manual operation has an additional wing nut that must

be positioned and tightened also.

4. Unblock rotating parts and turn the wheel by hand to

insure that

it rotates freely.

5. Start (bump) fan to check for proper rotation. Rotation is viewed

from the drive side (or behind the motor on A/4 fans). If the wheel

turns in the wrong direction, reverse motor rotation per motor instruc-

tions – usually by interchanging any two leads on a three phase


6. Start fan and allow unit to reach full speed, then shut down. During

this short period, check for excessive vibration, any unusual noise, or

overheating of the motor. Check the motor amps drawn against the

nameplate rating. A plate over the fan inlet will limit the horsepower

drawn during a test run with limited ductwork.

7. After the trial run lock the power “OFF”.

8. Recheck for tightness of hold-down bolts, wheel set screws and

keys, and retighten if necessary. Recheck after eight hours and again

after twenty-four hours of operation.