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 Size - Suitable for all AC 8in diameter 12125SDCLNGBX

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

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

75" width X 26

High Quality – High-quality aluminum with counter-sunk screw holes (screws included) and no sharp edges

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 Size Suitable for all AC 8in diameter 12125SDCLNGBX + Product Details Size 20"w X 8"h is the size for the duct opening measurement only + Product Details High Quality Aluminum housing on the outside and on the inside for the best insulation value