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2-3 System Venting Recommendation
FOR OPTIMAL PERFORMANCE!
- 1 SQUARE FOOT OF NET FREE VENTING PER 750 CFM
Venting plays a very significant role in the performace of whole house fans. QuietCool recommends a minimum
of 1 SQ. FT. for every 750 CFM in the QuietCool system. If an attic has at least 1:750 attic venting, the
QuietCool system will operate efficiently and effectively. If an attic has less than 1:750 attic venting, the
system may not operate as efficiently, or effectively, as it could with 1:750 attic venting. But don’t worry, the
system will still operate if there is not enough venting.
Insufficient venting is a very simple problem to fix. Roofing contractors can add extra venting to most homes
simply and easily. The most common types of venting is shown in the chart below.
RECOMMENDED VENTILATION: 1 SQ. FT FOR EACH 750 CFM
Vent Type
Model Type
Average Size
Venting Sq. Ft.
Gable vent
12” x 19.5”
1.20
Dormer Vent
14” x 8”
0.70
Eave Vent
4”
5”
6”
0.03
0.04
0.07
Ridge Vent
4’ - 12’
0.125 per ft
Soffit Vent
16” x 4”
16” x 6”
16” x 8”
0.19
0.29
0.39
O’Hagin Vent
Low/Medium Profile
Tapered Low Profile
Low Profile Flat
High Profile
0.5
0.6
0.68
0.68
Turbine Vent
8”
12”
14”
.35
.79
1.1
*Note: This table is only a guideline and is not a guarantee of venting capacity.
