4"W X 28"H [Duct Opening] Steel Air Vent Return Grille - HVAC VENT DUCT COVER DIFFUSER - [Outer Dimensions: 5.75"W X 29.75"H] Fixed Blades You may think of grilles

You may think of grilles and registers as a generic component of the ventilation system in your house

provides a modern look and quiet operation due to its half-inch by half-inch cube design

The grille features counter-sunk screw holes that prevent paint from peeling during installation

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4"W X 28"H [Duct Opening] Steel Air Vent Return Grille - HVAC VENT DUCT COVER DIFFUSER - [Outer Dimensions: 5.75"W X 29.75"H] Fixed Blades You may think of grilles+ Product Details Size 4"w X 28"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 5. 75" width X 29. 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.