sierra grates 4" x 12" white sidewall & ceiling register 2 way – steel air vent cover, hvac supply grille for wall or ceiling, fits 4x12 duct opening, heavy duty register, 4 pack 4x12 inch 4 is up for auction in Tools & Home Improvement. This item is in New/Like New condition. This auction has ended — similar items appear in live auctions regularly.