Air King Snap In installation Exhaust Fans Color:White Each vehicle has free rolling Size:4 1 2" Each vehicle has free rolling wheels and a sturdy die cast chassis 15" (381 mm) wide 4 inch round duct collar with a plastic damper protects against backdrafts and ensure quiet operation 2 Ventilation Local Local – – ENERGY STAR® certified No No No No Can be used to Comply with California Title 24 requirements No No No No CALGreen No No No No Duct Size 4″ round 4″ round 4″ round 4″ round Collar Damper Plastic Plastic Plastic Plastic Mounting SNAP IN Bracket SNAP IN Bracket SNAP IN Bracket SNAP IN Bracket Housing ABS Plastic ABS Plastic ABS Plastic ABS Plastic Dimensions