What is the humidity supposed to be?

[playswithfowl]

I was wondering what the humidity is suposed to be for a still air incubator for the first 18 days, and then what is it supposed to be for the last 3 days? I need to get mine ready because I need to get my eggs in a week or so.
Thank You,
AJ

 

[Tuffoldhen]

Anywhere between 40 to 50% the first 18....60 to 70% last 3....just so your close...nothing in stone, for most incubators....everyones house and bator are different....