16"W X 10"H [Duct Opening] Steel Air Vent Return Grille - HVAC VENT DUCT COVER DIFFUSER - [Outer Dimensions: 17.75"W X 11.75"H] w12h12 Ideal for Walls & Ceilings:

Ideal for Walls & Ceilings: Designed for seamless installation in standard 18" X 6" duct openings

Actual Filter Size – 31 3/4"w x 17 3/4" x 1"

It comes with two versatile mounting base options—solid and ring—making installation simple and flexible

actual front end outer dimensions are approximately 26 5/8" width X 10 5/8" height

16"W X 10"H [Duct Opening] Steel Air Vent Return Grille - HVAC VENT DUCT COVER DIFFUSER - [Outer Dimensions: 17.75"W X 11.75"H] w12h12 Ideal for Walls & Ceilings:+ Product Details Size 16"w X 10"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 17. 75" width X 11. 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