The purpose of wet curtain is to use the principle of water circulation, and then exhaust the air through the fan. It can reduce the temperature, but if the wet curtain is not well controlled, it is easy for chickens to have synaesthesia. Therefore, it is suggested that when the chicken is still young, try not to open the wet curtain and try to cool it with a fan. If it doesn't come down, use a wet curtain to cool down. The premise is that the wet curtain should not be used for too long at once, and it should be opened bit by bit to prevent the chicken from catching a cold too quickly.