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1.3 SYSTEM VENTING REQUIREMENTS
VERY IMPORTANT:
1 SQUARE FOOT OF NET FREE VENT AREA PER 750 CFM
RECOMMENDED:
2 TO 4 SQUARE FEET OF INLET VENTS PER FAN
Venting plays a very significant role in the performace of QuietCool fans. QuietCool recommends a mini-
mum of 1 SQ. FT. of venting 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.
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.
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