How Many Roof Vents Do I Need In My Roof

Because you always want your intake nfa to meet or exceed the amount of exhaust nfa we will take the amount of exhaust provided and divide by the nfa rating of the deck air.

How many roof vents do i need in my roof.

You will need to have 1 square foot of vent area for every 150 square feet of attic space. Rounding up you would need ten 10 750 vents. Based on your 1100 sq. So if your attic is 450 square feet you will need 3 square feet of vent space evened out throughout the entire space and divided equally between inlet and outlet vents.

You ll need the square footage of your attic to calculate the number of roof vents that you should need. Thus if your attic is 450 square feet you need roof vents equaling 3 square feet. Use the calculator below to find out how many exhaust and intake vents you will need on your house. Near ridge of the roof.

The net free area nfa ratingindicates the amount of space each roof vent covers. As a general rule your roof needs 1 square foot of vent area for every 150 square feet of attic space. For example if you have 1200 square feet of attic space you should need at least 4 air vents to ensure proper ventilation. And this guideline you ll need a minimum of.