4"W X 22"H [Duct Opening] Steel Air Vent Return Grille - HVAC VENT DUCT COVER DIFFUSER - [Outer Dimensions: 5.75"W X 23.75"H] Adjustable Return actual front end outer dimensions

actual front end outer dimensions are approximately 13

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This grille is ideal for both sidewall and ceiling installations

+ Product Details Size - 18"w X 24"h is the size for the duct opening measurement only

The operable dampers

4"W X 22"H [Duct Opening] Steel Air Vent Return Grille - HVAC VENT DUCT COVER DIFFUSER - [Outer Dimensions: 5.75"W X 23.75"H] Adjustable Return actual front end outer dimensions+ Product Details Size 4"w X 22"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 5. 75" width X 23. 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.