8"W X 4"H [Duct Opening] Steel Air Vent Return Grille - HVAC VENT DUCT COVER DIFFUSER - [Outer Dimensions: 9.75"W X 5.75"H] 2-Way + Product Details Perfect Fit

+ Product Details Perfect Fit & Easy Sizing - Designed for a 6" x 16" or 16" x 6" duct opening (measured at the opening)

+ Product Details Size & Compatibility – The 6" sheet metal 45-degree oval Flat duct angle is compatible with duct 6"

and its seamless drop-in installation process ensures effortless setup

actual front end outer dimensions are approximately 20 5/8" width X 22 5/8" height

+ Product Details Size – 4"w X 10"h or 10" x 4" is the size for the duct opening measurement only

8"W X 4"H [Duct Opening] Steel Air Vent Return Grille - HVAC VENT DUCT COVER DIFFUSER - [Outer Dimensions: 9.75"W X 5.75"H] 2-Way + Product Details Perfect Fit+ Product Details Size 8"w X 4"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 9. 75" width X 5. 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.