HBW Three-Way Plastic Side Wall/Ceiling Register in White 12" w X 6" h for Duct Opening (Outside Dimension is 13.75" w X 8" h)

HBW plastic sidewall/ceiling register is made of ABS plastic in bright white. It has built-in damper to control air flow. There are two screw holes on each side of the register to fix on the surface of wall or ceiling. Sidewall/Ceiling Register Measurement Outside overall dimension is 13.75”wide and 8”high Duct opening – a hole that holds the duct neck to allow air to come out from HVAC system. This register fits in a duct opening of 12”wide and 6”high. Size Selection Guide Measure the size of the air duct opening(the size of the “hole” ) . Measure the duct opening Match the duct opening size with the listed size of 12”x 6”.