28"W X 12"H [Duct Opening] Steel Air Vent Return Grille - HVAC VENT DUCT COVER DIFFUSER - [Outer Dimensions: 29.75"W X 13.75"H] RV Mobile Home + Product Details Size - 4 X 12 Is CRFG2028 Width_14in
Yard notes & kiln story
Description
+ Product Details Size - 25"w X 16"h is the size for the duct opening measurement only
designed for both sidewall and ceiling installations
9% Pure Copper meeting ASTM B280 standards
Pre-flared ends with nuts are for simple and easy installation
And is classified as Class 1 Fire Proof - B1
28"W X 12"H [Duct Opening] Steel Air Vent Return Grille HVAC VENT DUCT COVER DIFFUSER [Outer Dimensions: 29.75"W X 13.75"H] RV Mobile Home + Product Details Size 4 X 12 Is CRFG2028 Width_14in + Product Details Size 25"w X 16"h is the size for the duct opening measurement only designed for both sidewall and ceiling installations