20"W X 28"H [Duct Opening] Steel Air Vent Return Grille - HVAC VENT DUCT COVER DIFFUSER - [Outer Dimensions: 21.75"W X 29.75"H] w36h36 Our coils have a a

Our coils have a a very high PSI burst pressure

our grill boasts an impressive 96% airflow capacity

Both lines taped together every 18in for easier handling & installation

+ Product Details Size - 14"w X 24"h is the size for the duct opening measurement only

20"W X 28"H [Duct Opening] Steel Air Vent Return Grille - HVAC VENT DUCT COVER DIFFUSER - [Outer Dimensions: 21.75"W X 29.75"H] w36h36 Our coils have a a+ 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