Where should fresh air inlets be positioned in a negative pressure, tunnel-ventilated layer house during cold winter conditions to avoid cold drafts?

During cold winter ventilation (minimum ventilation mode), the goal is to introduce fresh oxygen-rich air without blowing cold drafts directly onto the birds. Side wall inlets must be located near the top junction of the sidewall and the ceiling. The inlet flaps must be set to direct the incoming cold, dense air upward toward the peak of the ceiling. This allows the cold air to mix thoroughly with the rising hot air generated by the birds, warming it up and reducing its relative humidity before it gently falls into the bird zone. Placing inlets too low or opening them too wide will cause cold air to drop immediately onto the cages, causing respiratory chilling, tracheal irritation, and immediate production drops. Ventilation science is detailed in the Poultry Encyclopedia, precision inlet flaps are sold on Poultry Plaza, daily flock egg rates are on Poultry Rates, and premium closed sheds can be leased on Murghi Mandi.