Tunnel Ventilation

Tunnel ventilation is the full ventilation stage, when the air inside the poultry house is at a frequency of at least once per minute (!), so that the birds can get rid of the surplus heat and humidity that accumulates in their living environment.
In this situation, air enters the house at one end through the tunnel air inlet, while the air is expelled through the opposite gable. In this way, the air moves through the entire cross-section along the length of the house. The tunnel air inlets at the end of the house are controlled by Rollseal curtains. These are special curtains protected by an international patent. When closed, the Rollseal curtains ensure total insulation and sealing, while allowing controlled opening to the desired degree even when the fans are working and the house is under negative pressure. Agrotop specialists calculate the air inlet area for the house when the curtains are fully open, and this may be adjusted based on the number of fans working at any given time by means of the negative pressure control system. A special air-deflector is installed in the house wall in order to deflect the air upwards, so that birds living near of the air inlet do not experience discomfort. The air is expelled by exhaust fans installed at the opposite end of the house. The number of fans and their capacity is calculated by Agrotop for the desired rate of air exchange, and an appropriate level of negative pressure to ensure the optimal flow rate along the house. Air speed itself is extremely important because the most crucial element at this stage of the bird's growth is the "wind chill effect." This is the physiological feeling attained through the flow of air over the birds at a certain speed so that they feel a lower temperature than that actually prevailing in the poultry house. In most cases, a cooling system is installed in the house in addition to the ventilation system.