20"W X 14"H [Duct Opening] Steel Air Vent Return Grille - HVAC VENT DUCT COVER DIFFUSER - [Outer Dimensions: 21.75"W X 15.75"H] sidewall actual front end outer dimensions

actual front end outer dimensions are approximately 12 5/8" width X 8 5/8" height -

Whilst the maximum pressure for R410 is 700 PSI

For a visual guide on how to measure your vent hole before ordering a grille

Every grille has a front end frame

+ Product Details Size – 8"w X 6"h is the size for the duct opening measurement only

20"W X 14"H [Duct Opening] Steel Air Vent Return Grille - HVAC VENT DUCT COVER DIFFUSER - [Outer Dimensions: 21.75"W X 15.75"H] sidewall actual front end outer dimensions+ Product Details Size 20"w X 14"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 21. 75" width X 15. 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