12"x 8" (Duct Opening Size) 3-Way Stamped Face Steel Ceiling/sidewall Air Supply Register - Vent Cover - Actual Outside Dimension 13.75" X 9.75" namely ASME A112

namely ASME A112

the connector provides excellent resistance to corrosion and ensures reliable gas flow for residential and commercial appliances

Width vs Height The first measurement in a return grille size is the width(horizontal measurement)

The premium black matte finish not only introduces a touch of elegance but also ensures exceptional resistance against rust and corrosion

Easy adjust air flow control with central lever

12"x 8" (Duct Opening Size) 3-Way Stamped Face Steel Ceiling/sidewall Air Supply Register - Vent Cover - Actual Outside Dimension 13.75" X 9.75" namely ASME A112The Listed size 12"x 8" is for inside duct opening measurement (the duct hole) , actual outside dimension is 13. 75" X 9. 75". Stamped Face Steel Construction with 1 2" fin spacing for high air flow Three 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