20"W X 2"H [Duct Opening] Steel Air Vent Return Grille - HVAC VENT DUCT COVER DIFFUSER - [Outer Dimensions: 21.75"W X 3.75"H] flat stamped steel And Meets/Beats ASTM B280 Standard

And Meets/Beats ASTM B280 Standard

+ Product Details Size - 24"w X 24"h is the size for the duct opening measurement only

With plain ends

+ Product Details Size - 10"w X 6"h is the size for the duct opening measurement only

positioning supply and return grills accordingly

20"W X 2"H [Duct Opening] Steel Air Vent Return Grille - HVAC VENT DUCT COVER DIFFUSER - [Outer Dimensions: 21.75"W X 3.75"H] flat stamped steel And Meets/Beats ASTM B280 Standard+ Product Details Size 20"w X 2"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 21. 75" width X 3. 75" height. Design Easy unrestricted airflow for your HVAC system 50 angled to provide maximum airflow. High Quality Solid stamped steel with counter sunk screw holes (screws included) and no sharp edges. Powder Coat Finish Smooth, shiny, scratch resistant, beautiful. Looks like it was just waxed.