Weak
As noted in previous reviews, these air vent covers aren't magnetically strong enough to cling to an air vent with air coming out of it. Hell, I couldn't get them to stay on even then the air wasn't blowing, much less when it was blowing.
For air returns, these would probably work okay if the magnetics were strong enough to hold it to the register.
Magnet does not stick
If you are using it for floor vents, it is fine, but I have a vent on the ceiling and it does not stay up.
Need 2 to cover an outlet
The problem is that when packed three together, the magnetic fields are weakened. I found two covers placed with the right polarity stick to a ceiling vent better. You also need to cut them to the vent size to reduce weight.
It's a good idea but the solution needs refinement.
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