30"W X 2"H [Duct Opening] Steel Air Vent Return Grille - HVAC VENT DUCT COVER DIFFUSER - [Outer Dimensions: 31.75"W X 3.75"H] sidewall that will overlap at wall

that will overlap at wall joint

75" width X 21

Installation Location – sidewall and ceiling

the second number represents the height

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30"W X 2"H [Duct Opening] Steel Air Vent Return Grille - HVAC VENT DUCT COVER DIFFUSER - [Outer Dimensions: 31.75"W X 3.75"H] sidewall that will overlap at wall+ Product Details Size 30"w X 2"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 31. 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.