Four-Way Plastic Side Wall/Ceiling Register in White 10" w X 10" h for Duct Opening 9" and two screws are

9" and two screws are included

INDUSTRY STANDARDS: - comply with ASME A112

Measure the duct opening where the vent can fit in

Two layers PVC core Braided with reinforced nylon wires in between for high performance and durable water supply applications

The Listed size 24"x6" is for inside duct opening measurement

Four-Way Plastic Side Wall/Ceiling Register in White 10" w X 10" h for Duct Opening 9" and two screws areFirst thing to know about size selection: take the vent cover off the wall or ceiling. Measure the duct opening where the vent can fit in. Use the measurement to determine right size to buy. This product has listed size 10w X 10h is for duct opening measurement only, actual outsize overall dimensions is 11. 75 wide by 11. 75 high. If your duct opening size is 10 x 10, this is the right size and will fit in well. If you measure outside or surface size,