10"W X 18"H [Duct Opening] Steel Air Vent Return Grille - HVAC VENT DUCT COVER DIFFUSER - [Outer Dimensions: 11.75"W X 19.75"H] Supply Grille With a 4" diameter for

With a 4" diameter for the duct opening measurement

Slots are angled to diversify the airflow in 2 way direction

The 1/2" black insulation

+ Product Details Size – 20"w X 10"h is the size for the duct opening measurement only

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10"W X 18"H [Duct Opening] Steel Air Vent Return Grille - HVAC VENT DUCT COVER DIFFUSER - [Outer Dimensions: 11.75"W X 19.75"H] Supply Grille With a 4" diameter for+ Product Details Size 10"w X 18"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 11. 75" width X 19. 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