Federal housing authority recommends a minimum of at least 1 square foot of attic ventilation for every 300 square feet of attic floor space evenly split between intake and exhaust.
Lomanco roof vent calculator.
The best return on investment for protecting the longevity of your home is the proper installation of a balanced ventilation system with the proven performance and quality of lomanco vents.
Vent calculator design your balanced ventilation system.
For balanced ventilation an equal amount of intake vent area net free area should also be installed.
The patented o hagin balanced ventilation system utilizes o hagin vents placed strategically within the field of roofing material both high near the ridge for exhaust and low near the eave for intake.
Determine square feet of code required ventilation.
Use the calculator below to find out how many exhaust and intake vents you will need on your house.
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.