Title: Very weak magnets
Review: I installed these on some ceiling vents today. The magnetic material is so weak it will barely hold up it's own weight. I kind of expected them to stick pretty well, but not the case. I have a single blower fan supplying all the vents in my house. I was attempting to block 6 metal vents which have only the standard factory paint. What I found was 3 of 6 fell off by morning.The good news is I returned them to Amazon and got a full refund. And because I ordered via Amazon Prime they even paid the return shipping. Gotta love Amazon Prime.
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