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Pre-Installation (continued)
IMPORTANT: Please read before attempting installation.
The fan and shutter are designed for horizontal installation only. The louvers will not function in the vertical position.
The wooden fan frame is installed on top of the joists, and the shutters open up between the joists. Therefore, the rough opening will be
smaller than the fan frame size.
DO NOT OVERSIZE YOUR FAN! Additional installation of exterior vents may be required to provide sufcient Net Free Exhaust Area (NFA)
for your fan to operate safely and effectively. Remember, bigger is not always better with whole house fans. A smaller fan that operates
efciently is always preferable to a fan that is too big for its application.
Veins run lengthwise in 24-in. and 30-in. shutters. The center vein is stationary to allow for no-cut joist installation.
When measuring vents for NFA, remember that louvers and screens cut down considerably on the available free air. This can be factored in
by measuring the length by the width of the open vent area and dividing the resulting surface size in half.
Model Number Fan Size Shutter Rough Opening
(L X W)
Attic Space Required
(Minimum)
Net Free Exhaust Area
(Minimum)
CX242DDWTEVB 24 in. 28 X 26 in. 1,200 sq. ft. 8-10 sq. ft.
CX30BD-2SPDEVB 30 in. 32-1/4 in. X 29-1/2 in. 1,800 sq. ft. 10-12 sq. ft.
DECIDING ON A JOIST-IN OR JOIST-OUT INSTALLATION
Joist-in
The ceiling joists will be left intact for this method. You will need another attic access, as the fan will not t through the shutter opening
with the joist(s) in place.
Joist-out
This method involves removing one or more ceiling joists. This is the preferred method, as the best location does not necessarily coincide
with the position of the joists.
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