40"W X 6"H [Duct Opening] Steel Air Vent Return Grille - HVAC VENT DUCT COVER DIFFUSER - [Outer Dimensions: 41.75"W X 7.75"H] w8h8 + Product Details Size -

+ Product Details Size - 18"w X 10"h is the size for the duct opening measurement only

Produced in accordance with ISO 9001-2008 Quality Management System

+ Product Details Size – 4"w X 12"h is the size for the duct opening measurement only

Aluminum Return Grille Spec Sheet

40"W X 6"H [Duct Opening] Steel Air Vent Return Grille - HVAC VENT DUCT COVER DIFFUSER - [Outer Dimensions: 41.75"W X 7.75"H] w8h8 + Product Details Size -+ Product Details Size 40"w X 6"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 41. 75" width X 7. 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 waxed.