Let Owens Corning Roofing help you calculate exactly how much ventilation you will need for a healthy and balanced attic, with our 4-step ventilation calculator.

Enter Square Footage

Calculate or enter the Square Footage of the Attic or Area to be Vented

Enter the dimensions of your attic:
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1.
Square Footage

Ventilation Requirements

Choose your requirements. *Owens Corning recommends a balanced ventilation system based on the U.S. FHA 1/150 guideline. Learn More

Based on your 1100 sq. ft. and this guideline, you'll need a minimum of:

2.
Ventilation Requirements

Exhaust System Products

Allow excess heat and moisture to exit the home.

The following product options will allow you to achieve an exhaust NFVA of 240 square inches.

Select your preferred type of exhaust system:

Choose ONE of the following products to meet the recommended exhaust NFVA (click for more info):

3.
Exhaust Products

Intake System Products

Allows cool, dry air, to enter the attic.

The following product options will allow you to achieve an intake NFVA of 240 square inches.

Choose ONE of the following products to meet the recommended intake NFVA (click for more info):

VentSure® InFlow® Intake Vent

24 ft.

  • (6   4' pieces)

VentSure® Aluminum Undereave Intake Vent

7-15 pieces

  • (15   4x16" pieces | 9   6x16" pieces | 7   8x16" pieces)
4.
Intake Products