20"W X 14"H [Duct Opening] Steel Air Vent Return Grille - HVAC VENT DUCT COVER DIFFUSER - [Outer Dimensions: 21.75"W X 15.75"H] Return You may think of grilles 4 X 12 Is CRFG2028 Width_14in

You may think of grilles and registers as a generic component of the ventilation system in your house

positioning supply and return grills accordingly

+ Product Details Size – 16"w X 20"h is the size for the duct opening measurement only

+ Product Details Size - 20"w X 34"h is the size for the duct opening measurement only

display === '') { dd

20"W X 14"H [Duct Opening] Steel Air Vent Return Grille HVAC VENT DUCT COVER DIFFUSER [Outer Dimensions: 21.75"W X 15.75"H] Return You may think of grilles 4 X 12 Is CRFG2028 Width_14in You may think of grilles and registers as a generic component of the ventilation system in your house positioning supply and return grills accordingly