4"W X 24"H [Duct Opening] Steel Air Vent Return Grille - HVAC VENT DUCT COVER DIFFUSER - [Outer Dimensions: 5.75"W X 25.75"H] Insulated Line + Product Details High Quality Product Details Perfect Fit Color_Anodized Aluminum AD-P-001-18x18

+ Product Details High Quality - Aluminum housing on the outside and on the inside for the best insulation value

+ Product Details Size - 20"w X 8"h is the size for the duct opening measurement only

and centralized air ducted units

75" width X 26

and slashes energy costs

4"W X 24"H [Duct Opening] Steel Air Vent Return Grille HVAC VENT DUCT COVER DIFFUSER [Outer Dimensions: 5.75"W X 25.75"H] Insulated Line + Product Details High Quality Product Details Perfect Fit Color_Anodized Aluminum AD P 001 18x18 + Product Details High Quality Aluminum housing on the outside and on the inside for the best insulation value + Product Details Size 20"w X 8"h is the size for the duct opening measurement only