zonon 12 pcs 12 x 4 inch ceiling register, steel hvac air vent cover, 3-way adjustable damper for ceiling, wall & floor, fits 12 x 4 inch duct opening (black) 12 x 4 inch black 12 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.