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Developing embryos require a flow of air to provide oxygen for respiration and to remove carbon dioxide.
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Rigid egg trays with an open mesh construction should be used to allow air to flow around the eggs and the addition of extra obstructions to air flow should be avoided.
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N.B. Air flow is lower in still air than in forced-air incubators and it is important not to overcrowd the eggs.
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The movement of air in an incubator containing eggs will be different from in the same incubator when empty, which is one reason why the incubator function should be checked with bantam eggs.
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Temperatures within the incubator may fluctuate if air flow is obstructed. If this cannot be rectified it is important to place eggs only in the most stable temperature areas of the incubator.
