Using the cooling system of cooling pad, the principle of water evaporation and heat absorption& the principle of negative pressure ventilation, to discharge the waste gas and dirty gas in the workshop, greenhouse or animal breeding shed and relieve the high temperature and sultry. After installation, it can effectively improve the high temperature and sultry environment in the workshop. It can make the temperature in the workshop (32-45â?? high temperature environment) drop rapidly within 10 minutes, and keep the temperature at 26-30â??. Its cooling ventilation effect, can be very effective to solve 95-99% of the workshop, greenhouse or animal breeding shed high temperature sultry, air dirty problem. Keeping the indoor temperature in the most comfortable working environment and the suitable temperature for the growth of animals and plants can improve the working efficiency of workers and the output of agricultural and sideline products.