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
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:
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):
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.