MagnaCard, Inc. Magnetic Decorative Vent Blockers, 5 x 12 Inches, Antique Look, 2 Vent Blockers (2 Packs) (30203) Value Pack! 2 - 2pks for a total of 4 decorative vent blockers Beautiful and easy to use, place magnetic cover over vent makes ugly vents instantly more beautiful! Instantly seals of unwanted airflow and directs air to the rooms you use most Cuts easily with sissors Blocks airflow by over 99% and helps reduce your fuel bills!