10"W X 20"H [Duct Opening] Steel Air Vent Return Grille - HVAC VENT DUCT COVER DIFFUSER - [Outer Dimensions: 11.75"W X 21.75"H] Powder Coated actual front end outer dimensions

actual front end outer dimensions are approximately 10 5/8" width X 12 5/8" height

Actual Filter Size – 33 3/4"w x 15 3/4" x 1"

Check Valve Installation: Verify that the check valve is correctly installed and the pump-mute wedge is integrated with the valve

Actual Filter Size – 13 3/4"w x 17 3/4" x 1"

10"W X 20"H [Duct Opening] Steel Air Vent Return Grille - HVAC VENT DUCT COVER DIFFUSER - [Outer Dimensions: 11.75"W X 21.75"H] Powder Coated actual front end outer dimensions+ Product Details Size 10"w X 20"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 11. 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