Lomanco Roof Vent Calculator

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. 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. Use the calculator below to find out how many exhaust and intake vents you will need on your house.

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Vent Calculator

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Vent Selector By Lomanco Vents

Lomanco Vents Instructions

Vent calculator design your balanced ventilation system.

Lomanco roof vent calculator.

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. For balanced ventilation an equal amount of intake vent area net free area should also be installed. Use avp s roof vent calculator to determine the number and size of exhaust vents you will need.

Enter square footage calculate or enter the square footage of the attic or area to be vented. 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. 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.