36"W X 4"H [Duct Opening] Steel Air Vent Return Grille - HVAC VENT DUCT COVER DIFFUSER - [Outer Dimensions: 37.75"W X 5.75"H] w30h30 represents the width

represents the width

Design – Designed to withstand bends and sharp turns without kinking

Designed for optimal air flow and lasting durability

High Quality – High-quality rust-free

Crafted from solid stamped steel

36"W X 4"H [Duct Opening] Steel Air Vent Return Grille - HVAC VENT DUCT COVER DIFFUSER - [Outer Dimensions: 37.75"W X 5.75"H] w30h30 represents the width+ Product Details Size 36"w X 4"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 37. 75" width X 5. 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.