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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.
During hatch, of course, you want high humidity in the range of 65% or more so that the chicks won't get stuck in the shell, but the goal is 40 to 50% for the first 19 days.lick on the RSS button after you add a comment to subscribe to the comment feed. Humidity is one of the most important factors determining your hatch rate, but, contrary to popular belief, high humidity is more troublesome than low humidity during most of the incubation period.