4" Round Screened Vent, brown - bag of 4 Plugs 380 si nfa (square inches

380 si nfa (square inches of net free ventilation area)

The tabs need to be bent over from the rear

2" Round Black No Screen Vent

4" Round Brown Open Screen Vent - bag of 4

The louvers are closely spaced to keep insects out

4" Round Screened Vent, brown - bag of 4 Plugs 380 si nfa (square inches4" Round Brown Screened Vent bag of 4 RLB 100 4" 4PK These round aluminum vents have louvers and a screen to keep insects out. They are easy to install in wood. Not made for glass, metal or PVC pipe. They fit into the hole made by a drill type hole saw and are held in place by knobs on the side of the vent. No nails or screws are needed. Fits into a 4 inch round hole. 3. 500 si nfa (square inches of net free ventilation area). Bag of 4 vents. Made in