Determine square feet of code required ventilation.
Lomanco roof vent calculator.
Enter square footage calculate or enter the square footage of the attic or area to be vented.
For balanced ventilation an equal amount of intake vent area net free area should also be installed.
Use the calculator below to find out how many exhaust and intake vents you will need on your house.
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.
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.
Vent calculator design your balanced ventilation system.