14"x 14" (Duct Opening Size) 4-Way Stamped Face Steel Ceiling/sidewall Air Supply Register - Vent Cover - Actual Outside Dimension 15.75" X 15.75" If your duct opening size

If your duct opening size is 8” x 4”

EASY FIT - Connect to faucet and water source with 3/8" comp x 1/2" FIP connection threads

household chemicals

it refers to the size of the "tongue"  so that it will fit in a 8"x8" hole

PERFORMANCE SPECS- Outstanding range of chemical resistance

14"x 14" (Duct Opening Size) 4-Way Stamped Face Steel Ceiling/sidewall Air Supply Register - Vent Cover - Actual Outside Dimension 15.75" X 15.75" If your duct opening sizeThe Listed size 14"x 14"is for inside duct opening measurement, actual outside dimension is 15. 75" X 15. 75" Stamped Face Steel Construction with 1 2" fin spacing for high air flow Four Way Air Flow deflection Design Multi shutter damper with easy handle to adjust desired amount of air flow Individually shrink wrapped with card board pad in the back for extra protection