4"W X 20"H [Duct Opening] Steel Air Vent Return Grille - HVAC VENT DUCT COVER DIFFUSER - [Outer Dimensions: 5.75"W X 21.75"H] w36h36 The total outer size of

The total outer size of this grille is the listed size plus 1

Suitable for all AC applications

and its seamless drop-in installation process ensures effortless setup

Looks Like It Was Just Waxed

4"W X 20"H [Duct Opening] Steel Air Vent Return Grille - HVAC VENT DUCT COVER DIFFUSER - [Outer Dimensions: 5.75"W X 21.75"H] w36h36 The total outer size of+ Product Details Size 4"w X 20"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 5. 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 waxed.