20"W X 36"H [Duct Opening] Steel Air Vent Return Grille - HVAC VENT DUCT COVER DIFFUSER - [Outer Dimensions: 21.75"W X 37.75"H] Brown But they are also the

But they are also the most visible representation of you air system

Operating from -40°F to +248°F

+ Product Details Size - 14"w X 22"h is the size for the duct opening measurement only

Each grille is securely shrink-wrapped with a cardboard backing to prevent damage during shipment

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20"W X 36"H [Duct Opening] Steel Air Vent Return Grille - HVAC VENT DUCT COVER DIFFUSER - [Outer Dimensions: 21.75"W X 37.75"H] Brown But they are also the+ Product Details Size 20"w X 36"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 21. 75" width X 37. 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