Roof Vent Free Area

Balanced ventilation will prolong the life of your roof while providing energy savings and comfort.

Roof vent free area. Made in the usa. Ventsure 4 foot strip heat moisture ridge vent with weather protector moisture barrier. 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. The calculations before indicated that we needed 2 square feet of ridge or upper roof ventilation.

This vent features an 1 8th inch internal aluminum screen to prevent intrusion by birds or large insects. Active ventilation products inc. Base offers added weatherproofing protection and ease of installation. The nfa is the open area that exists for air to pass through.

Universal dormer vent universal dormer vent 135 sq. Net free area uv 135. Two square feet equals 288 square inches. Large 16 1 2 x 16 1 2 in.

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. Calculate or enter the square footage of the attic or area to be vented. Sheet metal manufacturers of roof vents roof exhaust fans and solar attic fans. A normal metal pot vent produces only 50 squares inches of free net area.

So we would need at least six metal vents in addition to the lower soffit ventilation to meet minimum ventilation requirements. Roof vents are made from reliable 28 gauge galvanized steel. Venting products are normally rated with a net free area nfa.