We bought a Coleman tent that came with a battery powered fan. Used it for the first time to help HEAT our tent a few weeks ago. It has a switch on the side you can flip to change direction of the blades. It takes 4 "D" batteries. We ran it two nights in a row now and it was still working when we packed it away. The fan is not very big and hangs from the ceiling of our tent. We used it to push heat from a heater we had running ( made for tents that are ventilated ) down from the ceiling. Hope this helps you.