Roof Vent Free Area

Made in the usa.

Roof vent free area.

Ventsure 4 foot strip heat moisture ridge vent with weather protector moisture barrier. Balanced ventilation will prolong the life of your roof while providing energy savings and comfort. Active ventilation products inc. The key to effective venting is to balance air intake at your eaves soffits or fascias and air exhaust at or near your roof ridge.

Roof vents are made from reliable 28 gauge galvanized steel. Two square feet equals 288 square inches. Calculate or enter the square footage of the attic or area to be vented. A normal metal pot vent produces only 50 squares inches of free net area.

This vent features an 1 8th inch internal aluminum screen to prevent intrusion by birds or large insects. Build your roof empowers you to select each layer and component that goes into your total protection roofing system so that you get the roof you want to protect your home. Net free area uv 135. Sheet metal manufacturers of roof vents roof exhaust fans and solar attic fans.

Venting products are normally rated with a net free area nfa. Base offers added weatherproofing protection and ease of installation. Large 16 1 2 x 16 1 2 in. Ideally the nfa of the soffits should be equal or greater than that of the ridge vent and in no case should the amount of exhaust ventilation exceed the amount of intake ventilation.

The nfa is the open area that exists for air to pass through. Universal dormer vent universal dormer vent 135 sq. The passive vent net free area table gives the net free area ventilation for some common roof and gable passive vents.