Air blowing on a cham, even worst cold air, can cause some major health problems. It also makes it very hard for the cham to warn up to a temp where it can digest food properly. That can be a death sentence.
i have a fan specifically for my chameleon cage...BUT it is not pointed AT the cage, it is on the side of it and pointed at an angle at the wall so a small breeze can help with the drying process of water...