Title: The right size and shape, but magnet far too weak to actually block the air.
Review: The MVCX512 Magnetic Vent Covers are a bit of a joke. The magnetic force is so weak that not only will they not stay put when the air is blowing, they tend to curl and fall off even when put on any old flat piece of metal. The only reason I'm giving them 2 stars is that they are the right size and shape and sturdy enough to act as a vent cover when taped in place with duct tape.
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