I finished building my incubator (thanks to miss_prissys' plans). I ran it for 48 hours and was able to keep a pretty consistent temp of 99.7 to 101.00 degrees and the humidity at 52% (I used the learning pages on BYC for that info ) but my DH called and said the the temp had been reading 102 for about an hour so he shut the fan off (he believes it was causing the thermostat to cool off and to continuely run) , he said the temp had dropped back to 99.7 and was holding. My incubator is small, since this was my very first attempt I didnt want to try more than 5 or six eggs. My first question is 1. Is the fan a necessity? 2.Will the slight fluctuation in temp that I had cause problems? and last 3. Should I turn the fan back on?