How Many Roof Vents Does A House Need

For proper cooling and efficient operation any whole house comfort ventilator requires adequate unobstructed outlets in the attic through soffit vents grilles or louvers.

How many roof vents does a house need.

Choose one of the following products to meet the recommended exhaust nfva of 528 square inches. 6 measure the radius of round vents or take half the diameter of the. These specialty vents do not affect the. To calculate the amount of attic exhaust area you will need divide the fan s capacity in cfm by 750.

For example a 6 by 12 inch soffit vent has 72 square inches which when divided by 144 results in a 0 5 square foot opening. 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. Keep in mind you should always consult with a professional roofing company when determining how many air vents. Proper attic ventilation offers numerous advantages to the homeowner.

You ll need the square footage of your attic to calculate the number of roof vents that you should need. 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. As a general rule your roof needs 1 square foot of vent area for every 150 square feet of attic space. 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. Although there are many different types of roof vents to choose from ensuring you have the right number of both intake and exhaust vents is a central part of roof design. Advantages of proper roofing ventilation.