4" Round No screen vent - tab style, mill - bag of 4

4" Round Mill No Screen Vent, tab style - bag of 4 RLT-200 4"4PK These round aluminum vents have closely spaced louvers to keep insects out. They do not have a screen.They are easy to install into a 4" hole made by a drill-type hole saw. They are held in place by 6 tabs on the side of the vent. No nails or screws are needed. Note: These are made for thin materials like metal, glass or plastic. They do not work well in wood. The tabs need to be bent over from the rear. Fits into a 4 inch round hole. 3.682  si nfa (square inches of net free ventilation area). Bag of 4 vents. Made in the USA. Orders received by 3 pm MT will ship the next business day.