Fan for DIY incubator, how strong?

[Bettacreek]

If anything, wouldn't the temperature be too low if the fan gave out? Still air temps are supposed to be higher than forced air. Or would the fan drop the overall temp, but the temp near the eggs would be too high if the fan gave out...

As for the fan life, well, I did look up some stuff on my batteries, and apparantly, most will last around 12 hours (for my specific brand/size, but I'm not sure if AMOUNT of batteries plays a role, because the tests were all for two batteries, not three). Meh, I can always run it in a test run, then if it doesn't work, I'll go back to my still-air plans.

 

[BeardedChick]

I don't know for sure what it would do in your incubator, but knowing mine, it would temperature spike just enough to kill the eggs...

Rebel, I'm suprised a hair dryer fan has worked that well, too. Nice use of recycled items.

 

[rebelcowboysnb]

Recycled? Yea, that would have helped. I swiped it from the bathroom much to the longer haired family members dismay. I also swiped the bathroom space heater an put it in a deep freeze for a brooder. I'm regretting that one tonight. Were not suppose to see 0*F nights in Georgia.

If your thermostat is higher than the eggs the egg temp will drop if the fan fails an if the thermostat is lower than the eggs the egg temp will spike. If the thermostat is even with the eggs a fan failure as little effect on the eggs temp. (Thermal layering)