A single QC-1500 fan system may be installed by itself, but is not meant to be used alone for whole house cooling. Whole house fans are rated according to the amount of air they can move. This is measured in cubic feet of air per minute, or CFM. In order to be effective, a whole house fan?s CFM rating should be 2 to 3 times the square footage of the house or as much CFM as your roof venting will accommodate. For example, a 1,500 square foot, one story house will require a whole house fan system capable of moving air at a rate of 3,000-4,500 CFM. Too little CFM will not provide the desired minimum of 10 air exchanges per hour as recommended by the House Ventilation Institute, and may not provide the cooling draft to lower house, attic and skin temperatures in a timely fashion. See info page to determine the proper number of fans based on your sq. footage. This single fan unit is perfect for adding an additional 1500 CFM fan to your existing system.
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