10"x 8" (Duct Opening Size) 1-Way Stamped Face Steel Ceiling/sidewall Air Supply Register - Vent Cover - Actual Outside Dimension 11.75" X 9.75" The Listed size 14"x24" is

The Listed size 14"x24" is for inside duct opening measurement

Upgrade your HVAC system with this high-performance 3-cone ceiling air diffuser

The listed size 14" x 6" is for the inside duct opening measurement

2) measure the duct opening or the size of the hole

Individually shrink wrapped with card board pad in the back for extra protection

10"x 8" (Duct Opening Size) 1-Way Stamped Face Steel Ceiling/sidewall Air Supply Register - Vent Cover - Actual Outside Dimension 11.75" X 9.75" The Listed size 14"x24" isFirst 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 8h is for duct opening measurement only, actual outsize overall dimensions is 11. 75 wide by 9. 75 high. If your duct opening size is 10 x 8, this is the right size and will fit in well. If you measure outside or surface size,