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The relative humidity in the incubator between setting and three days prior to hatching should remain at 58-60% or 84-86 degree F., wet-bulb. When hatching, the humidity is increased to 65% relative humidity or more.An excellent method to determine correct humidity is to candle the eggs at various stages of incubation. The normal size of the air cell after 7, 14, and 18 days of incubation for a chicken egg is shown.or still-air incubators, add 2-3 degrees F. 2 Measured as degrees F. using a wet-bulb thermometer. Use chart to convert to relative humidity. Sanitation In large commercial incubators, eggs of different ages are often set and each setting transferred to a separate unit prior to hatching.
This is important since the air stratifies in these incubators. There can be as much as a 5Â° difference in temperature from the top to the bottom of some of the still-air incubators. Humidity should be 60-65% (80-90Â° wet bulb) during incubation and 70-75% (92-97Â° wet bulb) at hatching time.It is very easy to overheat the eggs in still-air incubators and difficult to maintain proper humidity.xtensive research has shown that the optimum incubator temperature is 100Â°F when relative humidity is 60 percent. Concentrations of oxygen should be above 20 percent, carbon dioxide should be below 0.5 percent, and air movement past the egg should be 12 cubic feet per minute.