Deflecto Magnetic Vent Cover, For Sidewall and Floor Vents, 8" x 15", 3 Pack (MVCX815)

I bought this product with very low expectations. I read all the reviews that said that the magnet is very weak, and the packaging itself says that it's not meant for ceiling vents. But I had some Amazon credit and decided to give it a shot anyway.After receiving the product, I'm pleasantly surprised. I gave it a try on two ceiling vents and it sticks! Sure, the magnet is very weak, but I guess that if there's enough surface area on the vent, the magnet is just strong enough to hold itself to the vent. It might be worth noting that the vent covers I bought are larger than the vents that I have. My vents are 7"x13", and the covers I bought are 8"x15". I figured that I could cut them down to size and place them inside the vents themselves if they didn't stick.Besides, if you have a bar magnet or a set of neodymium magnets, you can use it to reinforce the vent cover. In my picture, I stuck some magnetic buckyballs to the vent cover for demonstration, but they're not actually required for the cover to stay on the vent itself. If you already have a set of aesthetically pleasing bar magnets or small button magnets, I think these are a very viable solution to covering up vents. I did NOT receive this product at any discount. I paid full price.

We have an older 3 level house with one AC zone to control temperature. It takes careful tuning of all the vents and returns to get each room to an even temperature. We were looking for something that could help us adjust flow and return at a minimal cost. We came across this product and decided to give it a try. So we thought these would help as the vents being in a closed position is not enough of a seal. Conceptually the magnetic vent cover would be a great solution. However, the magnet used in this product is strong enough to only hold it on a floor vent. Keep in mind your vent grill does need to be metal as many decorative ones can be made of plastic. We tried putting it on wall vents and on ceiling vents. Neither one worked, the cover would just fall off. It did not work on the return vents either – where the flow should be into the vent as opposed to out of the vent where it would push the cover off. Overall - I do not recommend this product, you are better off just getting a piece of plastic and wrapping around the vent or place something behind to vent to limit flow. I was not given a discounted price or offer for a review of the product. We know how hard it is to assess a product from a picture on a webpage. I hope that the review can help you make an informed purchase.

Bought it in spite of the terrible reviews, i figured it's cheap enough that if it doesn't work well It wouldn't be the end all-be all. But I am pleasantly surprised, the magnet on mine works just fine. It's not a super powerful magnet, but its strong enough to hold in place. Maybe it depends on the type of metal the vent is made of? I live in a really old house which has the original register vents which are made out of very heavy steel...and again they hold perfectly here. Also, cutting them to the size you need is very easy as they are very floppy and on the thin side....this was a good thing for me as my vents are 8x12 and I did need to cut them to size.

Purchased these to compensate for the fact that we live in a rental house that has been repainted numerous times. The vents no longer close on their own and we thought these would solve the issue of unused rooms being heated. These work, mostly.Cons:1) They do the job they were intended to do, but there is a reason the picture shows them peeled back, they have no place for the vent handle and they do not cut very cleanly, so making your own hole is a hassle.2) They give off an unpleasant plastic odor. We have had them on for a few weeks and they still do this every time the heat comes on.3) They are essentially very weak magnet sheets like what fridge business cards are made from. We live in an area with frequent 1.0-3.0 earthquakes. The magnets are so weak that they have fallen off the walls several times during very minor quakes.Pros:1) They were inexpensive, especially compared to the same product from Home Depot which cost $25.2) They do seal the vent well enough that it blocks wasted heat leakage.3) Light weight enough that when they fall off the wall, they don't damage things below them.

I don't know what problems other people had, our vent covers work fine. We unpacked them, stuck them on the vents, and they haven't fallen off. Our vents are on the walls and we've only used them with the air conditioning. Don't know how they will work with the heat on. They hold on to the vents, completely block the airflow, and that's what they are supposed to do. We were able to improve the air temperature distribution in the house.2/14 Down the road- they do fall off and we resorted to using very strong magnets to hold them on.

Purchased these to cover two wall vents, and they work perfectly. The vents both have a lever on the left side to open and close. I obviously have set that to the close position. To make the covers fit perfectly, I aligned their left side with the right edge of the lever, and trimmed the excess inch or so that would have protruded from the right of the vent. I also used an exacto knife to cut a small circle to allow the screw on the right side of the vent to protrude through the cover. This ensures a snug, flush fit. If you don't put these on properly, some air can continue to get through, which is likely why others are complaining that they fall off. My advice is to take these steps to get a nice tight fit. Don't let the other reviews dissuade you -- I wish I had purchased these much earlier. Highly recommended!