24"W X 10"H [Duct Opening] Steel Air Vent Return Grille - HVAC VENT DUCT COVER DIFFUSER - [Outer Dimensions: 25.75"W X 11.75"H] Black Energy Efficient – Air-tight inner Suitable for all AC 8in diameter 12125SDCLNGBX

Energy Efficient – Air-tight inner core decreases the pressure loss and provides a more hygienic environment - high energy efficient / No fiberglass erosion into air stream

+ Product Details Size – 24" x 24" is the size for the duct opening measurement only

75" width X 37

+ Product Details Size – 8" x 16" or 16" x 8" is the size for the duct opening measurement only

24"W X 10"H [Duct Opening] Steel Air Vent Return Grille HVAC VENT DUCT COVER DIFFUSER [Outer Dimensions: 25.75"W X 11.75"H] Black Energy Efficient – Air tight inner Suitable for all AC 8in diameter 12125SDCLNGBX Energy Efficient – Air tight inner core decreases the pressure loss and provides a more hygienic environment high energy efficient No fiberglass erosion into air stream + Product Details Size – 24" x 24" is the size for the duct opening measurement only