20"W X 6"H [Duct Opening] Steel Air Vent Return Grille - HVAC VENT DUCT COVER DIFFUSER - [Outer Dimensions: 21.75"W X 7.75"H] w36h36 + Product Details Size – 4 X 12 Is CRFG2028 Width_14in
Yard notes & kiln story
Description
20"W X 6"H [Duct Opening] Steel Air Vent Return Grille HVAC VENT DUCT COVER DIFFUSER [Outer Dimensions: 21.75"W X 7.75"H] w36h36 + Product Details Size – 4 X 12 Is CRFG2028 Width_14in + Product Details Size – 18"w X 8"h is the size for the duct opening measurement only this HVAC vent duct cover ensures durability and reliability