The Everbilt 20 in. x 20 in. Steel Return Air Filter Grille in White is a durable and versatile HVAC vent designed for installation in ceilings or walls. Made of steel with a 1/2 inch thickness, this square-shaped grille features louvered design and is compatible with ducted evaporative coolers and central air conditioners. With a manufacturer warranty of 1 year, this vent from Everbilt is a reliable choice for any HVAC system.