4" X 30" Heavy Duty Rigid Floor Grille - Fixed Blades Air Grill - Brown 4"w X 30"h Is The Size For The Duct Opening Measurement Only, Actual Front End Outer Dimensions Are 6" Width X 31.75" Height - SEE BELOW IN DESCRIPTION HOW TO MEASURE A GRILLE Rigid Extra Heavy Duty to withstand constant walk on situations - Powder-Coat Finish - Smooth, Shiny, Beautiful. Looks Like It Was Just Waxed Quality Packaging - Carefully Shrink Wrapped With Cardboard Backing To Prevent Damage In Shipment Smooth Surface Edges - Run Your Fingers Across The Surface To Feel The Smoothness Easy Unrestricted Air Flow For Your HVAC System