Mini round louvers are an economical way to maximize air flow to the attic while preventing large insects and small birds from entering. Easy to install by just tapping in, these louvers primarily fill in "Bird Block" holes left in wood rafters for ventilation. Avoids damage to painted areas from vapor and frost.
- Overall size 4-1/2 in. in diameter
- Fits 4 in. diameter holes
- 4.11 sq. in. net free vent area
- Sold individually to meet your needed quantity