Builders Edge 1.40037E+11 Exhaust Vent, White, Copolymer Impact Spring-adjusted firing power to match

Spring-adjusted firing power to match wood density

Better shape and stiffness retention

Covered end paints corner

Two blower wheels

Builders Edge 1.40037E+11 Exhaust Vent, White, Copolymer Impact Spring-adjusted firing power to matchHighlights: Opening Width : 4 inches Color : White Material : Copolymer Coverage Area : 12 sq in Exterior Diameter : 1. 6 inches Exterior Width : 7 inches Exhaust vent for side walls with patented exhaust flaps which stay closed when not in use Comes complete with 8 inch aluminum tube (4 inch diameter) Optional small animal guard sold separately Warning: Suspected of damaging fertility or the unborn child. Obtain special instructions before use. Do