Quote:
For still air, the temp should be 102F at the top of the eggs. Not at the middle. Not down on the wire. 102F AT THE TOP of the eggs.
The reason is that the air temps are different temps, at different layers. Warm air rises. If the temp at the top is 102F, the bottom will be cooler. The center will be about 100F. If the temp is 102 at the bottom, on the wire, or on the turner bottom, the top will be about 104 and all the eggs will die.
The reason I'm so emphatic, is that I see, over and over, people post, "I know it said 102 at the top, but I had it at 102 at the bottom and none of my eggs hatched, boo-hoo what went wrong?!?" Failure to follow directions is what went wrong.
Not saying YOU will do that, but people do, all the time.
So, now that I ranted at you for no reason, good luck, I hope you have a good hatch!
If you haven't set the first ones yet, maybe you should wait and set them all at once. That way you have lower risk of losing the later ones to too much humidity the last few days.
You need about 40%-45% the first 18 days, mine does that with no water added, then about 55% from day 18, and it will go up when eggs start to hatch. Try not to let it go over 70%. Too much humidity means too little oxygen. I increase air flow at the end by putting a q-tip stick sideways under 2 corners of the lid, (just slide it in until it hits that ridge that fits into the slot, so the stick is against the ridge, not under it.) it increases the airflow without lowering the temp. I get better hatches that way.