What is the standard air speed velocity requirement in a tunnel-ventilated brown layer shed during peak summer?

In sub-continental climates where summer temperatures regularly exceed 42°C in regions like Multan, Faisalabad, and Bahawalpur, wind-chill velocity is the primary mechanism to keep hens alive. Panting alone cannot cool down a heavy-bodied brown layer hen. High-velocity air (2.5 to 3.0 m/s) passing over the bird's feathers breaks the boundary layer of trapped hot air, facilitating heat dissipation from her comb, wattles, and skin. If air speed drops below 2.0 m/s, heat accumulates rapidly, causing severe heat stress, an immediate drop in feed intake, thin-shelled eggs, and mass mortality. Maintaining high-capacity, static-pressure-rated exhaust fans and tight ceiling seals is critical. Farmers can learn ventilation fluid dynamics in the Poultry Encyclopedia, purchase heavy-duty exhaust fans on Poultry Plaza, monitor daily egg prices on Poultry Rates, and list healthy stock on Murghi Mandi.