16"W X 16"H [Duct Opening] Steel Air Vent Return Grille - HVAC VENT DUCT COVER DIFFUSER - [Outer Dimensions: 17.75"W X 17.75"H] Supply Grille + Product Details Size – 4 X 12 Is CRFG2028 Width_14in
Yard notes & kiln story
Description
+ Product Details Size – 12" X 4" is the size for the duct opening (floor/vent hole) measurement only
+ Product Details Size - 40"w X 6"h is the size for the duct opening measurement only
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16"W X 16"H [Duct Opening] Steel Air Vent Return Grille HVAC VENT DUCT COVER DIFFUSER [Outer Dimensions: 17.75"W X 17.75"H] Supply Grille + Product Details Size – 4 X 12 Is CRFG2028 Width_14in + Product Details Size – 12" X 4" is the size for the duct opening (floor vent hole) measurement only + Product Details Size 40"w X 6"h is the size for the duct opening measurement only