Commercial Witches Hat Vent | 8″ Diameter 11″ Collar | 50 Sq. In. NFA | Model WHV-8-C11

$45.00

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The witches hat vent has a seamless top, preventing water and snow entry. The internal louvers prevent insects, rodents or birds from entering. The witches hat ventilates the attic by letting out hot air in the summer and moisture in the winter, and is ideal for flat or low sloped roofs. The detachable head allows for easy installation on EPDM, PVC, TPO and other roof membranes. Constructed of heavy gauge, rust free aluminum.

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Calculate number of Model WH-8-C11 Vents Needed for a Given Area

Enter the Width and Length of the attic space you need to ventilate to calculate the area. You may also enter the area directly in the "Area" field. It is not necessary to hit the Return or Enter key (which will refresh this page), just enter numbers in the fields.


Enter width of space to calculate area (or enter Area below)


Enter width of space to calculate area (or enter Area below)


If you know it, you may enter the area directly here

The diameter size of all roof vents determines the Net Free Area, also known as the "NFA". NFA is the measured amount of opening each vent offers at each specific size. to be available for venting air through a specific vent size. The calculator below will find the overall number of vents needed to effectively ventilate the targeted attic space.

Once you have the area, the numbers shown below are the number of vents of that size which would ventilate the specified area with both 1/300 and 1/150 rule.

Results Appear Here





*Please note
The roof vent calculation values shown above are for the exhaust portion of the roof. The same amount of net free air inches is needed for air intake as well. Proper roof ventilation consists of 50% air exhaust and 50% air intake.


Select Options and Click "Add To Cart" button below

Base Price (Before options):

$45.00

Brand: Active VentilationUPC(GTIN): 843951009100 Model WH-8-C11 Category:
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