Ventamatic CX36BD2SPD User Manual download pdf (Page 3)

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HOW DO THEY WORK?

Whole House Fans are designed to pull in fresh,

cool air from the outside through open windows in

the living space. Hot air is pulled up through the

fan, into the attic, and then exhausted through

static vents in the undereaves, soffits, roof or

gables.

The necessary exhaust ventilation is measured

in square feet of Net Free Area (NFA).

Failure to provide sufficient NFA will reduce the

fan's efficiency, resulting in noisy operation and

the ultimate failure of the motor.

FAN SIZE

SQUARE

FOOTAGE OF

LIVING AREA, OR

ATTIC SIZE IF

MULTI-STORY

MINIMUM NFA

(NET FREE AREA)

EXHAUST

REQUIRED

24-in

up to 1800 sq ft

if 1 story, or attic

size if multistory

8 to 10 sq ft

(1152 to 1440 sq

in)

30-in

2000 to 3000 sq ft

if 1 story, or attic

size if multistory

10 to 12 sq ft

(1440 to 1728 sq

in)

36-in

over 3200 sq ft

if 1 story, or attic

size if multistory

12 to 14 sq ft (1728

to 2016 sq in)

•

Drill

•

1/4” and 1/8” drill bits

•

Straight edge ruler (yardstick, 4 ft level)

•

Pencil or marker

•

Circular saw

•

Ring shank drywall nails (1 1/2”)

•

#12D nails

•

Adjustable wrench

•

Flat head screwdriver

•

Phillips head screwdriver

•

Safety goggles

•

Speed square

•

Saber saw, reciprocating saw

Tools and Materials Needed:

SELECT THE INSTALLATION SITE

Every house is different and there is no set rule for

the choice of the best site. Check the attic

immediately above potential sites for ducts, piping

or wiring that would obstruct the installation area.

The location should also be an area which is open

during operation. Generally they are installed in

hallways or laundry areas. However they should

not be too close to the kitchen or bathrooms so as

not to exhaust unwanted odors, grease, or humidity

into your attic.

The installation site must provide approximately 48-

in of unobstructed clearance between the fan

blades and the roof, in order for the exhausted air

to disperse correctly and not drop back down on the

shutters.

Joist-in Installation Joist-out Installation

If you choose this method, you will leave the

ceiling joists intact. You will also need to have

another attic access, as the fan will not fit through

the shutter opening with the joist(s) in place.

This is the preferred method, as the best location

will not necessarily coincide with the position of

the joists. For this method, you will remove one or

more ceiling joists.

READ THE FOLLOWING BEFORE PROCEEDING

The fan and shutter are designed for horizontal installation only - the louvers will not function in the vertical

position. Decide whether you will use a Joist-In or Joist-Out installation.

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Ventamatic CX36BD2SPD User Manual Page 3

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