Circulated air is good! LG (Little Giants) are functional, but need a little help, but its easy.
1. They don't always hold heat great, so its important to have heat sinks. (ex, a whole bunch of eggs, not like 6 - or if its NOT an auto turner, I'd fill some small jars w/lids up with water, and stick them all around the outside edges) Heat sinks are basically anything with enough mass to get to the right temp, and stay there. The fuller your bator is, the better it will hold the idea temp of 99.5 F. You want it too hold this temp, and hold it well. This will make your eggies hatch better.
2. They have humidity issues. I simply keep 2 sponges (the normal dishwash sort with lots of various sized wholes, kinda feels a bit like cloth, not the one that is clearly just some kind of plastic) below each bator window. When you turn eggs (3 x a day, as close to 8 hours apart as humany possible- I like 7am, 3 pm, and last minute before bed....remember how I was always up until 11 pm our time? It was so I could turn the eggs and go to bed!)
3. That
little tiny skinny knob used to adjust temps is gonna make you want to pound your head on a wall, it adjust TOO MUCH! Here is the solution. Do you have a hot glue gun??? I hope so, otherwise you gotta use superglue or rubber cement. I find a stiff piece of clear plastic (like you find in wrapping from packaging) and I cut out a 1.5" round disc. I mark the center with a pen. I warm up the hot glue gun, and put a drop of glue onto my dot, and quickly stick it onto the LG KNOB for adj. temps, and hold it firmly 30 seconds. Now, draw on arrows with a permanent marker noting UP and DOWN. Know, you can very finely adjust your temps without moving it by 2 degrees. BARELY move the thing at all when you make adjustments, and then wait 3 hours before you touch it again. LGs temps range a bit, but if you do #1 well, you'll have FAR FAR LESS TROUBLE AND NOT LOSE YOUR MIND like you will if you don't. Trust me on this, I'm giving you pearls.
4. Put folded washclothes or cut pieces of cardboard over the windows when you leave the bator. This will help it hold in heat much better.
I'm so happy you have a bator! Remember, first attempts to hatch don't count. Make the bator get to temp for 2 full days w/o trouble before you put in a living egg. Use the heat sinks, its very important.