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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.
Monitor the humidity in the incubator daily to ensure that you keep it at the right percentage for the chicken eggs to hatch. Increase the humidity during the last three days of incubation to 65 percent, 88 degrees Fahrenheit wet bulb or 99.5 degrees Fahrenheit dry bulb reading.ow air humidity causes eggs to lose moisture. When the egg dries out, the chick sticks to the shell and will not hatch. You can use a wet bulb thermometer to determine the amount of humidity in the air and get humidity by utilizing a pan of water.