I purchased this fan to use for providing a flow of air in an enclosed space. The space in which I was sanding was less than 40 degrees F during my work. The unit was inside the space and the hose blowing outside. The unit worked very well for about 15 minutes and then stopped working. At first I thought that the circuit breaker on the plus was defective, but it wasn't blown. I reset the circuit breaker and the unit started up again. The fan stopped working after about 10 min., and this time, as I was still working, I just ignored it. The fan started up again after a while, but then stopped. I think that the thermal protection kicked in and stopped the fan, then when it cooled down a bit, would start again ... over and over and over again. One star because it is just a big orange paper weight at this point. I regret the purchase.