30"W X 16"H [Duct Opening] Steel Air Vent Return Grille - HVAC VENT DUCT COVER DIFFUSER - [Outer Dimensions: 31.75"W X 17.75"H] Color_White + Product Details Size - 4 X 12 Is CRFG2028 Width_14in

+ Product Details Size - 20"w X 10"h is the size for the duct opening measurement only

+ Product Details Size - 26"w X 8"h is the size for the duct opening measurement only

And is classified as Class 1 Fire Proof - B1

Powder-Coat Finish - Smooth

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30"W X 16"H [Duct Opening] Steel Air Vent Return Grille HVAC VENT DUCT COVER DIFFUSER [Outer Dimensions: 31.75"W X 17.75"H] Color_White + Product Details Size 4 X 12 Is CRFG2028 Width_14in + Product Details Size 20"w X 10"h is the size for the duct opening measurement only + Product Details Size 26"w X 8"h is the size for the duct opening measurement only