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Active Ventilation Products – Attic Vent Calculator

For years we have been working with Architects and Specifiers to ensure affordable roof ventilation that upholds building code standards.
Our passive roof vents are UL Certified, and rated to withstand wind pressure in excess of 200mph.

Are you ventilating to code?

Use AVP’s Roof Vent Calculator to determine the size of vent and how many vents are needed

architects and specifiers - resources

You do not need to go back to school to understand the building science behind roof ventilation
“The basic breakdown”

Home owners and professionals alike have questions and concerns about how to properly ventilate their roof. Which roof vents are best based on roof type, climate, and budget for example:
We want to share those questions and answers with you.

Question: What are the building code requirements for ventilating a roof?

Answer: 1 square foot of ventilation for every 300 square feet of space
for pitched roofs with vapor barriers
1 square foot of ventilation for every 150 square feet of space
no vapor barrier and for some municipalities in hot climates

Example Building

1,000 Divided by 300 = 3.33 Total Square Feet.
50% Intake 1.7 Sq. Ft. & 50% Exhaust 1.7 Sq. Ft

1,000 Divided by 150 = 6.66 Total Square Feet
50% Intake 3.3 Sq. Ft. & 50% Exhaust 3.3 Sq. Ft.

Rendered 3D flat roof building, 20 ft wide x 50 ft long.