Air Vent Article


 NRCA’s Recommendations for Attic Ventilation


  • Ventilate Attics @ 1/150 Ratio. “When designing for attic ventilation, NRCA recommends designers provide for attic ventilation in the minimum amount of 1 square foot of net free ventilation area for every 150 square feet of attic space (1:150 ventilation ratio) measured at the attic floor level (e.g. ceiling).

  • Balance the Ventilation with Intake & Exhaust. “NRCA also recommends the amount of ventilation in static ventilation systems be balanced between the eave and ridge.”

  • Increase the Ventilation for Steeper Roofs. “For large-volume attic spaces, such as where roof slopes are greater than 8:12, designers should consider increasing the amount of ventilation to account for additional volume of attic space.”


external link NOTE: From The NRCA Roofing Manual: Architectural Metal Flashing and Condensation and Air Leakage Control – 2022





Air Vent Contractor LocatorOur exclusive Contractor Locator will allow you to find contractors in your area who can assist with Air Vent product installation—including solar attic fans and skylight tubes. Click the link below to register and get started.


Search for Contractors
Cookies user preferences
We use cookies to ensure you to get the best experience on our website. If you decline the use of cookies, this website may not function as expected.
Accept all
Decline all
By using this website, you agree to our use of cookies. We use cookies to provide you with a great experience and to help our website run effectively.
Tools used to analyze the data to measure the effectiveness of a website and to understand how it works.
Google Analytics