MagnaCard, Inc Magnetic Vent Blocker, 5 x 12 Inches, 2 Vent Blockers (2 Packs), Colors May Vary (VB5/122)
MagnaCard Magnetic Vent Blockers 5" x 12" in white. Blocks airflow by over 99%. Simple to use, just place magnetic cover over vent and Instantly seals off unwanted airflow and directs air to the rooms you use most. Cuts easily to size. Contains 4 total vent blockers in white 5"x12" size.