Using Negative Pressure During Minimum Ventilation
During minimum ventilation, the air inlets operate on the basis of negative pressure. By setting the air inlets
properly and managing the negative pressure in the house the speed at which outside air enters the house
through the air inlets can be controlled. During minimum ventilation negative pressure should be high
enough to direct the cold incoming air at high speed away from the birds up toward the apex of the house
where the warm air accumulates. If negative pressure is too low the cold air will simply drop onto the chicks
chilling them and creating wet litter (Figure 32).