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.
Lomanco roof vent calculator.
Vent calculator design your balanced ventilation system.
Use the calculator below to find out how many exhaust and intake vents you will need on your house.
Enter square footage calculate or enter the square footage of the attic or area to be vented.
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.
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.
Use avp s roof vent calculator to determine the number and size of exhaust vents you will need.