Use the calculator below to find out how many exhaust and intake vents you will need on your house.
Lomanco roof vent calculator.
Enter square footage calculate or enter the square footage of the attic or area to be vented.
Vent calculator design your balanced ventilation system.
Determine square feet of code required ventilation.
All lomanco attic ventilation product requirements are based on the minimum standard 1 300 rule as set forth by the international building code ibc and the international residential code irc.
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.
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.