I was actually going to try a mini-fan in my hovabator. Sealed containers here too. Im using a proportional thermostat in there, and the temps were allover the place even with that.
It seems the placement of the probe, is pretty important though. If I put it where the eggs go, the temp bounces ALOT more because the heat has to travel so far to be registered by the probe. Then its up and down as the heater warms and cools. It would have been better with the wafer. LOL
Then I tried putting the probe closer to the heating element, and had to set the temp much higher (since it was near the top), but it didnt bounce nearly as much down below. The thermo had more control over the heat that way.
All of the heat in those things stays in the top, and only radiates downward, so I took off the plastic window last year, and just aimed a fan at the hole from afar. Believe it or not, the temps stayed alot better. When it wasnt too hot in here that is
I agree w/ Jeremy, I would hate to even possibly be the cause of an accident, Sorry bud.