Registers, Vents and Duct Pipe

Deflect-O venting and register components: 4 in. aluminum vent pipe and semi-rigid duct, vent elbows, duct connectors and increaser/reducers, ABS register covers and magnetic vent covers, and stove pipe wire. Four inch is the standard residential dryer and appliance vent size, and the length of the run is what governs performance — every elbow costs the equivalent of several feet of straight duct against the appliance’s rated maximum. Rigid and semi-rigid aluminum are what to specify; flexible foil and plastic duct trap lint and are not accepted in many jurisdictions. Magnetic and adjustable register covers are a balancing tool for a room that overheats, and closing too many at once raises static pressure on the blower rather than redistributing the air.