How Many Roof Vents Do I Need In My Roof

Thus if your attic is 450 square feet you need roof vents equaling 3 square feet.

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. Use the calculator below to find out how many exhaust and intake vents you will need on your house. They should be divided equally between inlet and outlet vents and they can be used in any combination that will work with your roof s design. Near ridge of the roof.

As a general rule your roof needs 1 square foot of vent area for every 150 square feet of attic space. And this guideline you ll need a minimum of. You ll need the square footage of your attic to calculate the number of roof vents that you should need. 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.

Rounding up you would need ten 10 750 vents. Based on your 1100 sq. The net free area nfa ratingindicates the amount of space each roof vent covers. To calculate the number of 750 vents needed divide 480 by 50 to get 9 6 vents.