be careful in the fan that you use in a small incubator. I have a fan that run off of 115 volts, the fan that I use in my small incubator is about the size of a computer fan. but since it's an ac fan not a dc fan, it will heat up the inside of my incubator. I have a dimmer switch on it to control the speed of the fan. and in the summer if I run it 100% power, it will heat my incubator up over 92 degrees. my big glass door coke cooler doesn't have this problem as it's way too big for a fan to effect the temps much. in a small incubator go with a dc fan. hope this helps! don