I like the humidity at about 45% on day 19, 50-55% on day 20, and 65-75% during the hatch.
I was sitting at 52% before the first chick hatch. While chicks were hatching and drying the humidity was up to 65%. At the end of the day I was back down to 52% with two still working, so I opened the vent put my tube in and added water. Oops! Forgot to close the vent when i was done.
Every hatch the humidity works a little different as the humidity outside the incubator varies where I hatch keep my incubator. Last time I was at 65% before the chicks started to hatch and then had to open the vents in the hatcher half way because condensate was forming inside the incubator when chicks we drying. My incubator and hatcher lack any sophisticated accessories for regulating the environment, so I monitor and make adjustments manually.
Edited by GaryDean26 - 7/25/12 at 2:23pm