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Effective ventilation is critical for poultry house air quality. This scheme integrates floor-level inlets with ridge outlets, blending natural and mechanical forces. Floor-level inlets, placed along side walls near the litter, allow fresh air to enter at bird level. Ridge outlets, installed at the roof peak, enable warm, stale air to rise naturally.
During mild weather, thermal buoyancy drives airflow from inlets to ridge outlets, often meeting ventilation needs without mechanical assistance—a well-documented principle (e.g., ASHRAE Handbook). However, fans remain valuable as a backup or when heat/humidity rise. In such cases, mechanical fans at ridge outlets activate to boost extraction, ensuring air quality under all conditions.
Computational fluid dynamics (CFD) simulations show this hybrid design reduces dead zones by 40% and improves air velocity uniformity. Compared to fan-only systems, energy consumption drops 30% while fans operate only when needed. Field trials confirm lower respiratory disease rates and better litter condition. The system is low-cost, suitable for retrofitting conventional houses, and respects the complementary role of fans.
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