28"W X 36"H [Duct Opening] Steel Air Vent Return Grille - HVAC VENT DUCT COVER DIFFUSER - [Outer Dimensions: 29.75"W X 37.75"H] Color_Red Oak Wood + Product Details Size –

+ Product Details Size – 20" x 20" is the size for the duct opening measurement only

This simple adjustment reduces HVAC strain

+ Product Details Size - 4"w X 36"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 37

28"W X 36"H [Duct Opening] Steel Air Vent Return Grille - HVAC VENT DUCT COVER DIFFUSER - [Outer Dimensions: 29.75"W X 37.75"H] Color_Red Oak Wood + Product Details Size –+ Product Details Size 28"w X 36"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 29. 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