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 16"wx20h" is

The Listed size 16"wx20h" is for inside duct opening measurement

•The Listed size 10"x 8" is for inside duct opening measurement

actual outside dimension is 25

then select the listed size of 14”x 8”

buy a 16x25 grille

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 16"wx20h" 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,