Abstract: A method that increases the volume of fresh air into hatchers (10) during the last 24 hours before chicks are pulled from the hatcher (10). This method increases the volume of fresh air into the hatcher (10), while at the same time not upsetting the preset internal temperature and humidity settings inside the hatcher (10). This is done by gradually increasing the hatcher hallway room (24) temperature, humidity and air pressure at predetermined times to predetermined settings during the final 24 hours of the three day hatch cycle, which causes the damper door (22) on top of the hatcher (10) to open and stay open, thereby allowing a greater volume of fresh air to be forced into the hatcher (10). Due to the increased air pressure, excess carbon dioxide is exhausted out the back of the hatcher (10) through the exhaust vents (18) dropping the carbon dioxide level to the lowest level possible to benefit newly hatch chicks.