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I have a Sportsman 1502 with the supplemental reservoir on top so the water pan never runs dry. The humidity stays between 45-47 and I never mess with it. I transfer the eggs from the turner trays to the hatching tray in the bottom two days before the hatch making sure to keep the incubator door shut as much as possible and the eggs out of the incubator as little as possible.
I'm usually hatching anywhere from a dozen to three dozen eggs at a time. When the eggs hatch the humidity automatically rises due to the moisture in the shells and on the chicks. If I remember right the humidity gets to about 52-55 during the hatch.
The ONLY time I mess with the humidity is when I have to open the incubator to pull out chicks from the hatching tray due to over crowding. Because I often have several breeding pens going at once, I have to separate the eggs in hatching tray so I can toe-punch accordingly. I had a separator built for just this. Sometimes due to the number of eggs in a divider, I have to pull chicks out in order to allow room for the other eggs to hatch. When that happens, I will spray the eggs down with water and add the humidifier pad to the water pad to prevent the membranes from sticking to the chicks and preventing them from getting out.
God Bless,