18"W X 20"H [Duct Opening] Steel Air Vent Return Grille - HVAC VENT DUCT COVER DIFFUSER - [Outer Dimensions: 19.75"W X 21.75"H] Black /* Adding space between bullet

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positioning supply and return grills accordingly

will change the appearance of the entire room

The 1/2" black insulation

Carefully shrink wrapped with cardboard backing to prevent damage in shipment

18"W X 20"H [Duct Opening] Steel Air Vent Return Grille - HVAC VENT DUCT COVER DIFFUSER - [Outer Dimensions: 19.75"W X 21.75"H] Black /* Adding space between bullet+ Product Details Size 18"w X 20"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 19. 75" width X 21. 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