The National Fenestration Rating Council’s (NFRC) Ventilation Rating Task Group developed a new ventilation rating after several years of task group work. The efforts were led by chair Ray Garries.

“This optional rating standardizes the methods to measure the ventilation area of operable fenestration products and delivers a rating based on the ratio of frame area to ventilation area,” says Garries. “The key point here is that NFRC will now be able to supply the key part of the formula for effective natural ventilation, as in the equation from Autodesk.”

NFRC 401: Procedure for Determining Fenestration Product Ventilation Rating was approved by NFRC members at the Spring 2016 Committee Meeting. Now published for review purposes only, the rating is not yet implemented, as updates to the Certified Products Directory software are required.