How do poultry operations calculate and optimize the minimum ventilation fan cycle during cold winter nights to remove moisture without chilling birds?

During freezing winter nights in districts like Rawalpindi and Abbottabad, keeping birds warm while removing excess moisture is a delicate balancing act. To optimize the minimum ventilation fan cycle, farmers use a mathematical equation based on bird biomass: 10,000 mature brown layers excrete approximately 2,000 liters of water per day via respiration and droppings. To remove this moisture without dropping house temperatures below 18°C, exhaust fans are operated on a repeating 5-minute (300-second) cycle. For example, the controller is programmed for 45 seconds ON (to pull in fresh air and exhaust humid air) and 255 seconds OFF. The sidewall inlets are opened slightly to maintain a high static pressure of 0.15 inches of water column, ensuring the cold air jet-streams to the ceiling peak to mix before reaching the birds. Thermodynamics are explained in the Poultry Encyclopedia, digital climate controllers and heavy-duty space heaters are sold on Poultry Plaza, daily bird prices are tracked on Poultry Rates, and automated closed-house farms operate on Murghi Mandi.