PERFECT FIT GUARANTEED - Just Make Sure To Check Your Duct Opening Size First! This return air grille is designed to fit a 36 x 36 duct opening. Do not measure your old vent cover - just the actual hole in the wall or ceiling. The outer dimensions are 1" wider for frame overlap and clean finish BUILT TO LAST - Heavy-Duty Flat Stamped Steel Construction Crafted from premium stamped steel, this vent cover features a solid, sturdy build with no sharp edges. Counter-sunk screw holes and included screws ensure a secure installation that stays in place for years. SMOOTH BLADES FOR MAXIMUM AIRFLOW Engineered for efficiency, the grille's fixed angled fins promote unrestricted airflow, To get the most out of your HVAC system. Enjoy better air circulation and consistent comfort throughout your space. QUICK & SIMPLE INSTALLATION - With the screws included u will have a real ez time installing your hvac grille. The counter-sunk screw holes create a flush, professional look on both walls and ceilings-perfect for DIYers and pros alike. CLEAN LOOK - Scratch-Resistant Powder-Coated Finish Finished in a sleek, bright white powder coat, this vent grille resists scratches and blends seamlessly with most interior decors. Carefully shrink-wrapped with cardboard backing to ensure it arrives in perfect condition. Why HVAC Premium? You may think of grilles and registers as a generic component of the ventilation system in your house. But they are also the most visible representation of you air system. With HVAC Premium you get an extra measure of quality that will be visible to your family members and house guests. Every part is hand inspected for quality before it is packaged, no exceptions. No Sharp Surface Edges. Just run your finger along the edge of the top plate and you will find a smooth finished surface. Heavy Gauge Steel. Heavier gauge than needed, built for durability and long life in mind, but still light and handy. Powder-Coat Finish - Smooth, Shiny, Scratch-Resistant, Beautiful. Looks Like It Was Just Waxed