36"W X 20"H [Duct Opening] Steel Air Vent Return Grille - HVAC VENT DUCT COVER DIFFUSER - [Outer Dimensions: 37.75"W X 21.75"H] Adjustable Return + Product Details Size - 4 X 12 Is CRFG2028 Width_14in

+ Product Details Size - 10"w X 36"h is the size for the duct opening measurement only

+ Product Details Size - 6"w X 18"h is the size for the duct opening measurement only

polished appearance that adds elegance to any room

Looks Like It Was Just Waxed

R value rating of insulation - R3

36"W X 20"H [Duct Opening] Steel Air Vent Return Grille HVAC VENT DUCT COVER DIFFUSER [Outer Dimensions: 37.75"W X 21.75"H] Adjustable Return + Product Details Size 4 X 12 Is CRFG2028 Width_14in + Product Details Size 10"w X 36"h is the size for the duct opening measurement only + Product Details Size 6"w X 18"h is the size for the duct opening measurement only