Good ventilation can keep the air in the incubators hatching eggs fresh and help the embryo develop well. In the late incubation period, the metabolism of chicken embryos is vigorous and the gas exchange volume increases. At this time, poor ventilation will seriously affect the hatching effect. However, in actual operation, we often encounter some doubts: the ventilation volume of the general incubator is controlled by the size of the opening damper.

In the cold winter, some incubators have poor thermal insulation facilities. When the air door is opened, the temperature of the incubator always fails to reach the set value; when the opening is small, there is concern about poor ventilation. In fact, electric incubators are equipped with high-speed rotating fans, which not only agitate the air in the incubator to make the temperature uniform, but also generate a large negative pressure when high-speed rotation can suck the air outside the incubator into the incubator.

Therefore, as long as the air door is not completely closed, as long as the fan does not stop, the fresh air from outside will continuously enter the incubator. At the same time, the turbid gas in the incubator will also be excluded from the incubator, so it will not have much impact on the hatching effect. Of course, if the ambient temperature in the incubator room can be relatively stable at around 20°C, the air door will be opened larger, the ventilation will be greater, and the hatching effect will be better.

In actual operation, under the premise that the temperature in the incubator can reach the set value, it is necessary to open the big air door to speed up the air circulation as much as possible. When the ambient temperature in the hatchery is low, the damper can be closed in the early stage of incubation, and ventilation and heat preservation should be taken into consideration in the later stage of the incubation. Generally speaking, the damper can be reduced by one level compared to the standard ambient temperature (20-24℃). How much influence will the reduction of ventilation have on the hatching effect.

One thing to note: In many models of incubators, the position of the air inlet and outlet and the rotation direction of the fan should not be changed at will. When the power is connected, if the sequence of a certain phase line is wrong, the fan may be reversed, which will seriously affect the gas exchange inside and outside the incubator, which will adversely affect the hatching effect.