4"W X 36"H [Duct Opening] Steel Air Vent Return Grille - HVAC VENT DUCT COVER DIFFUSER - [Outer Dimensions: 5.75"W X 37.75"H] RV Mobile Home + Product Details Size –

+ Product Details Size – 30"w X 8"h is the size for the duct opening measurement only

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you can watch this informative video tutorial: How to Measure Your Vent Hole Before Ordering a Grille

+ Product Description Maximize the efficiency of your ventilation system with our top-of-the-line HVAC grilles and registers

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4"W X 36"H [Duct Opening] Steel Air Vent Return Grille - HVAC VENT DUCT COVER DIFFUSER - [Outer Dimensions: 5.75"W X 37.75"H] RV Mobile Home + Product Details Size –+ Product Details Size 4"w X 36"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 5. 75" width X 37. 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.