Used to replace a burned out box fan that has had its fan blade loose, binding and causing the original fan opened. Looks good and the specs are the same. In fact, unless it overheats and explodes, you can't be sure it's fully functional. I'm pretty sure it works as it should. You'll find these things in small electrical appliances, motors, coffee makers, etc. You need to make sure the specs match what you're replacing. Two things are generally important: the temperature at which it opens and…