4"W X 28"H [Duct Opening] Steel Air Vent Return Grille - HVAC VENT DUCT COVER DIFFUSER - [Outer Dimensions: 5.75"W X 29.75"H] Material_Aluminum + Product Details Size -

+ Product Details Size - 4"w X 20"h is the size for the duct opening measurement only

75" width X 11

+ Product Details Size - 16"w X 32"h is the size for the duct opening measurement only

75" height

Great emphasis has been invested in the design of this product to prevent it from kinking in sharp bends & turns and to hold steady and at full diameter in all applications

4"W X 28"H [Duct Opening] Steel Air Vent Return Grille - HVAC VENT DUCT COVER DIFFUSER - [Outer Dimensions: 5.75"W X 29.75"H] Material_Aluminum + Product Details Size -+ Product Details Size 4"w X 28"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 5. 75" width X 29. 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.