Product Brochure

18
QUIETCOOLSYSTEMS.COM
VENTING YOUR ATTIC FOR QUIETCOOL
Whole house fans vent air from the outside, into
the house through open windows, into the attic,
and out the attic vents to the outside world. In
order for a QuietCool system to run efficiently
and effectively, there needs to be adequate attic
venting to allow the system to pressurize the air
outside.
At QuietCool, we recommend homes have a
minimum of 1 square foot of net free vent area
(NFVA) for every 750 CFM in the whole house
fan system. This minimum recommendation is
validated by most third party agencies including
the US Department of Energy (DOE) and Pacific Gas
and Electrict (PG&E).
To calculate the amount of venting needed by fan
model, simply divide the CFM specification by 750.
This will give you the square footage of NFVA that
will be needed.
Example: (1) QC CL-4700 - 4505/750 = 6.01 NFVA
The venting requirement is not something of
concern to most QuietCool purchasers unless the
home was built before the mid 1970s. Most homes
built since mid 1970 will have adequate venting to
vent a basic QuietCool system.
However, for all applications, we encourage
contractors and dealers to visually inspect, and if
necessary measure, the available venting in any
attic in which a QuietCool system is to be installed.
Inspecting venting is very easy and takes little time.
ADVANCED WHOLE HOUSE FANS
®
PROPER VENTILATION
NET FREE AREA VENTING