20"W X 16"H [Duct Opening] Steel Air Vent Return Grille - HVAC VENT DUCT COVER DIFFUSER - [Outer Dimensions: 21.75"W X 17.75"H] 18" Round Duct Pipe accordion-content { display: block

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4" X 10" Is The Size For The Duct Opening (floor/vent hole) Measurement Only

+ Why Hvac Premium HVAC Premium has been providing superior quality service for many years

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

European: EN 10270-1-SM

20"W X 16"H [Duct Opening] Steel Air Vent Return Grille - HVAC VENT DUCT COVER DIFFUSER - [Outer Dimensions: 21.75"W X 17.75"H] 18" Round Duct Pipe accordion-content { display: block+ Product Details Size 20"w X 16"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 21. 75" width X 17. 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