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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.
Humidity is important, because it keeps the egg from losing too much or too little moisture during the incubation process. Humidity should be balanced with temperature, because different temperatures require different relative humidities. A table outlining the relationship can be found on p.15 of Beginning of Life.A. Relative humidity should be 60-65% for the first 18 days of incubation, and 70% for the last three days.he humidity should be 70% at this point, and opening the incubator would lower the humidity. If 70% humidity is not maintained the membranes could dry out too soon and trap the chick inside the egg and not allow hatch.