Sprinkler systems used in conjunction with fans are an example of direct surface cooling. Sprinkling provides an independent cooling process (evaporation) that is then increased by the fans and air flow (wind chill) over the birds. By focusing on direct cooling of individual birds, this system avoids cooling and over-humidifying the entire house, which is counterproductive to the chicken’s natural ability to cool itself through panting and evaporative respiration.