Cascade Series Install Manual

page 7 of 16

The ideal orientation of unit’s gravity damper is in a level position. If necessary, however, the damper can be in-

stalled at a slight angle. TIP: before beginning the installation, make sure that the fan assembly is undamaged,

and that the fan blade rotates freely. Brace or clamp the fan assembly to a secure object, and temporarily plug

in the fan’s power cord into a grounded power outlet to verify smooth and correct operation.

Be aware that the fan is quite powerful and will draw in loose objects or de

bris, and will blow dirt, debris

and other objects with force!

Use eye protection when operating the fan to avoid injury from blowing sand or debris! Keep hands and

other objects away from the rotating fan blade!

TIP: Before beginning the installation, verify that the damper assembly is undamaged, and that the damper doors

operate freely, opening and closing fully without binding or restriction.

INSTALLATION: GRAVITY DAMPER

GRAVITY DAMPER ORIENTATION NOTE

1. From consideration of the principles of whole-house fan

operation, determine the best general area for installation

of the gravity damper assembly. The damper assembly is to

be mounted in the attic with its bottom edge opening into

and  ush with the ceiling of the living space. The eggcrate

inlet grille is to be mounted on the ceiling of the living

space, covering and engaging with the opening of the

damper assembly.

2. Using the cardboard from the fan system’s packaging, or

other suitable material, make a rectangular template for the

rough opening of the damper assembly to these dimensions

(making sure all sides are at right angles to each other):

a. Cascade CA2 and CA3 models: 14-1/4” wide, 22-1/4” long

b. Cascade CA4 and CA5 models: 14-1/4” wide, 30-1/4” long

FIGURE 1 - TEMPLATE

3. Take the template into the attic, above the general area for installation, and determine the exact desired

location for the rough opening for installation of the damper assembly. There must be at least 36” of

vertical clearance above the damper assembly location, and the damper assembly must be fastened to

secure framing (ceiling joist, roof truss, or additional framing) along at least one long side or both short

sides of the damper assembly! Add additional framing as required to support the weight of the damper

assembly and duct.

a. For existing construction, the  anges surrounding the opening of the damper assembly may be

removed for clearance (as with 16” on-center framing) and/or to allow the side or sides of the

damper assembly to make direct contact with the framing used to support the damper assembly.

Leave  anges in place if they will not be fastened to framing, if possible. Additional framing

may be added after the damper assembly is placed into the rough opening, so the  anges can

remain in place if space allows.

b. For new construction, before the ceiling drywall is hung, frame in a rough opening for

installation of the damper assembly from below. Leave the assembly  anges in place and

simply attach the damper assembly to the bottom of the framing using appropriate fasteners

installed through the  anges. Skip all following steps regarding cutting the rough opening into the

ceiling and proceed with installation of the duct and fan assembly.

P/N 780105001 11/20 Rev A