DON'T Open !!
Once the first few hatch - the humidity will increase on it's own.
Opening while a hatch is in progress can be a death sentence for those still pipping if the humidity drops significantly.
Our youngest son had hatched eggs for his 5th grade Science Fair project.
He decided that he wanted to keep the 7 chicks.
Temporary quarters consisted of a series of cardboard Chick Condos.
Permanent hen house needed to be conservative in space and size.
We decided to go "Green" and re-utilize...