Hi Iris, I do not know what your original questiton was but a friend of mine came up with a solution for me. I have an aluminum shutter on the back wall of my greenhouse and our neighborhood is famous for electricity outages which meant my greenhouse was getting way to warm on occasion. So I purchased an automobile fan, which are very thin and mounted it on the shutter and he wired it to a wheelchair battery and a thermostadt. I put the thermostadt on 90 degrees and put the battery on a battery charger and it turns on at 90 degrees and takes the hot air out through the aluminum shutter. Works great!
Syd
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