20"W X 26"H [Duct Opening] Steel Air Vent Return Grille - HVAC VENT DUCT COVER DIFFUSER - [Outer Dimensions: 21.75"W X 27.75"H] w6h6 Designed for a 1" thick

Designed for a 1" thick filter

Premium Airflow Efficiency - High-performance cube core eggcrate design allows 95% airflow efficiency

875" height

+ Product Details Size - 22"w X 6"h is the size for the duct opening measurement only

this flex duct decreases the pressure loss and provides a more hygienic environment

20"W X 26"H [Duct Opening] Steel Air Vent Return Grille - HVAC VENT DUCT COVER DIFFUSER - [Outer Dimensions: 21.75"W X 27.75"H] w6h6 Designed for a 1" thick+ Product Details Size 20"w X 28"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 21. 75" width X 29. 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