12"W X 10"H [Duct Opening] Steel Air Vent Return Grille - HVAC VENT DUCT COVER DIFFUSER - [Outer Dimensions: 13.75"W X 11.75"H] w10h10 which the interior PET provides

which the interior PET provides

+ Product Details Size - 6"w X 10"h is the size for the duct opening measurement only

European: EN 10270-1-SM

Aluminum Return Grille Spec Sheet

+ Product Details Size – 14"w X 4"h is the size for the duct opening measurement only

12"W X 10"H [Duct Opening] Steel Air Vent Return Grille - HVAC VENT DUCT COVER DIFFUSER - [Outer Dimensions: 13.75"W X 11.75"H] w10h10 which the interior PET provides+ Product Details Size 12"w X 10"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 13. 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