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Specifications
Power Attic Ventilators

HOW TO SIZE POWER VENTS?
Power vents are rated in CFM—cubic feet of air moved per minute. The higher the CFM, the more powerful the vent and the more air exchanges per hour it provides. To determine the minimum CFM required, multiply the attic square footage by 0.7. For example:

1500 square feet x 0.7 = 1050 CFM
Thus, a fan rated at least 1050 CFM is needed.

HOW MUCH INTAKE VENTILATION?
Just like any exhaust vent power vents need intake airflow to perform properly. To calculate how much intake the power vent needs simply divide the fan's CFM capacity by 300 and then convert that number to square inches.

AIR VENT POWER VENTS

ROOF-MOUNT MODELS

Model	Color	CFM	For Attics Up To:
Quality Roof-Mount RV26 Automatic Thermostat Plastic dome	Gray, Brown	1170	1650 sq. ft.
Quality Roof-Mount RV26 Automatic Thermostat Metal dome	Gray, Brown, Weatherwood	1170	1650 sq. ft.
Premium Roof-Mount RV28 Automatic Thermostat Metal Dome	Gray, Brown Weatherwood	1320	1900 sq. ft.
Premium High-Powered Roof-Mount SV3000 Automatic Thermostat Metal dome	Brown, Black Weatherwood	1500	2100 sq. ft.
Premium Plus All Season™ ASR-HP High-Powered Roof-Mount Automatic Thermostat and Humidistat Metal dome	Grey, Brown, Black Weatherwood	1500	2100 sq. ft.

GABLE-MOUNT MODELS

Model	CFM	For Attics Up To:
Gable-Mount WCGA Automatic Thermostat	1050	1500 square feet
Gable-Mount WCGB Automatic Thermostat	1320	1900 square feet
Gable-Mount APG Automatic Thermostat	1620	2300 square feet
Gable-Mount APGH Automatic Thermostat and Humidistat	1620	2300 square feet