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Floor Mounted Rubber-In-Shear (RIS) Isolators

1. Mount fan and motor on an isolation base (if supplied).

2. Elevate fan to provide room to insert isolators between

the base and foundation and block in position.

3. Position isolators under fan and secure bolts.

4. Remove blocks and allow fan to rest on floor. Isolators

must be installed on a level surface (leveling should

not be required).

5. Secure isolators to mounting surface.

Duct Installation

Efficient fan performance relies on the proper installation

of inlet and discharge ducts. Be sure your fan conforms to

the following guidelines.

Non-Ducted Inlet Clearance: If your fan has an open inlet

(no duct work), the fan must be placed 1 fan wheel diameter

away from walls and bulkheads.

Free Discharge: Avoid a free discharge into the plenum.

This will result in lost efficiency because it doesn’t allow for

a static regain.

Inlet Duct Turns: For ducted inlets, allow at least 3 fan

wheel diameters between duct turns or elbows and the fan

inlet.

Discharge Duct Turns: Where possible, allow 3 duct diame-

ters between duct turns or elbows and the fan outlet. Refer

to figure above.

Non-ducted Inlet

MIN 1 DIA

Clearance

Free Discharge

Correct

Incorrect

Correct

Incorrect

Inlet Duct Turns

MIN 3

DIA

Correct

Incorrect

Discharge Duct Turns

MIN 3

DIA

Use the following guidelines to calculate foundation size:

• The overall dimensions of the foundation should

extend at least 6 inches beyond the outline of the fan

and its motor.

• The weight of the foundation should be 2 to 3 times the

weight of the unit and its motor.

Isolation

NOTICE! Although a certain amount of vibration is

inherent in operating centrifugal fans, extreme

vibration is a serious problem that may cause

structural and mechanical failure.

Isolation Base: To prevent vibration and noise from being

transferred to the building isolators are recommended.

Isolators should be located between the fan system and the

support structure.

Ceiling Mounted Isolators: Some applications require fan

systems designed for floor mounting to be suspended from

ceiling supports. In such cases, all fans should be installed

on either rails or bases in the classical orientation. Typically,

these systems are hung from the corners by rods, which

include isolation hangers of either spring or rubber-in-shear

design. NOTICE! Under no circumstances is the fan to

be inverted and hung by its base angles.

Floor Mounted Spring Isolators

1. Mount fan and motor on isolation base (if supplied).

2. Elevate fan (or isolation base) to operating height and

insert blocks to hold in position.

3. Position isolators under the fan and vertically align by

inserting leveling bolt through mounting holes in the

fan or the base. The isolator must be installed on a

level surface.

4. Adjust the isolators by turning the leveling nut counter

clockwise several turns at a time alternately on each

isolator until the fan weight is transferred onto the

isolators and the fan raises uniformly off the blocks.

Then remove the blocks.

5. Turn lock nut onto leveling bolt and secure firmly in

place against the top of the mounting flange or frame.

6. Secure isolators to mounting surface.

Rubber-In-Shear Ceiling Isolators

Ceiling Mounted Spring Isolator

Figure 1 - Ceiling Mount Isolators

Figure 2 -Floor Mount Isolators

Rubber-In-Shear Isolator

Spring Isolator

1 2 3 4 5 6 7 8

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Cook FCP User Manual Page 2

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