![GBAD Full Color.png]](https://help.gibraltarbuildingproducts.com/hs-fs/hubfs/GBAD%20Full%20Color.png?height=40&name=GBAD%20Full%20Color.png){kind=small}
What is Net Free Area?
The total unobstructed area through which air can enter or exhaust a non-powered vent
The total unobstructed area through which air can enter or exhaust a non-powered vent; generally measured in square inches. All nonpowered vents have a Net Free Area rating.