Magnetic Vent Covers 3-Pack Pockets for Complete Seal 5.5" X 12" White

BOOST air to the rooms you need it BLOCK air in unoccupied rooms NO AIR GAPS- The only cover that conforms to the vent damper creating a COMPLETE SEAL WARNING Not all metal vents are magnetic. Not for aluminum/high vents. See listing pic 5 for details *Save Money by shutting off air flow to unused rooms *Keep your little ones' fingers from getting caught between the vent grille *Keep harmful dust/debris out during your demo/remodel *Improve duct cleaning by providing a stronger negative pressure