Witten Automatic VentBestvents 315CBL Foundation Vent

Installed these in the garden shed/greenhouse my husband built. They are great. They automatically open and close to vent hot air without the need for electricity. Almost like magic. Easy to install. A super value!

I replaced my vents with these foundation vents around my house. They look nice as a finished project. The only suggestion I have for the manufacturer is to use phillips head screws rather than slotted screws

I purchased 8 of these vents. and 4 of them did not close when the weather got cold, causing my pipes to freeze, Amazon did nothing for me, said my 30 days were up. We had very warm days , so I did not check them out. spend a lot of money on amazon, and I think they would have taken them back. Sorry to say I will spend my money somewhere else. Shame on you amazon

I like the looks of these vents. But I had to make some adjustment for some of them to open and close. Two of the vents still wouldn't close. I think there can be some improvement, in the making of these vents. They say's that theses vents supposes to close at a temperature of 40, I don't think that is accurate. Some of these vents are still open at 35 degree. Some don't closes all the way either. Buy at your on risk.

They work exactly as advertised -- open at 70 degrees, closed at 40 degrees. They close tightly enough that I don't feel drafts.

I bought these because, with the constantly changing weather here I get tired of having manually open and close the vents all the time. I installed 4 of these 2 on either side of the house. I have thermostatically controlled fans on one side I have them set to.turn on of as the vents open and close. Keeps the air moving on warm days and closed on cold. They are working great so far. Easy to install.

Put 4 of these in my freezer overnight. Only 1 partially closed. Good concept but poor craftsmanship.

This was very easy to install with some cement caulk and appears to work very well opening and closing. Fit right in where the old vent hole was. Cool.