Suction fan is the use of air convection cooling principle of negative pressure ventilation, the installation location of the door or window --- natural fresh air, indoor outdoor hot gas quickly forced out any poor ventilation problems can be improved machine, cooling ventilation effect of up to 90% -97%. Utilizing the principle of evaporative cooling suction fan, generally in the outdoor air through the wet curtain, by the evaporation of water absorbs heat, leading to air cooling, become cool air, the indoor temperature effective cooling, another feature of the wet curtain cooling ventilation system that the cooling process the dust filtered outdoor air exhaust, the oxygen content of the intake air increases, the air introduced into the plant within a fresher, more preferably operating environment for air quality. After the end of the installation in the plant's cooling equipment wet curtain wall, while the other end of the suction fan is installed, apply suction fan inside the hot air out of the plant, resulting in less than outdoor indoor Kia Kia, prompting the outside air through the wet curtain piece cooling, variable into the cold air into the interior of the plant, to the cooling effect, thereby creating a comfortable, cool, leisurely work environment advantage ※ set ventilation, ventilation and cooling in one. ※ energy: low power consumption, only about 10-15% of traditional air conditioning. ※ environmental protection: no Freon (CFC). ※ good cooling effect: the outside air through the cooling water showering after entering the room, the cool side curtain indoor temperature can reach 5-10 degrees of cooling effect. ※ high return on investment, payback costs 2-3 years. ※ quickly cloudy, hot and smelly replace exhausted to the outside air indoors. ※ effective control of the indoor environment, indoor produce different wind speeds, resulting in cool effect, it is unusual to feel comfortable and fresh. ※ reduce infectious diseases, such as influenza and effective prevention of sudden large-scale spread of the virus. Birds, mosquitoes, flies are vector-borne diseases due to water POON negative pressure ventilation system is closed, will reduce the spread of the probability vectors, enable staff to work in a comfortable safe and secure environment. 3, suction fan Scope: A, suitable for high temperature or smell of the workshop: such as heat treatment plant, casting plant, plastics plant, aluminum factory, shoe, leather factory, electroplating plants, a variety of chemical plants. B, applicable to labor-intensive enterprises: such as garment factory, various assembly shop, internet cafe. C, ventilation and cooling greenhouse horticulture, livestock farms cool. D, especially for applications that require cooling also requires a certain humidity locations. Such as cotton, wool mills, jute mill, weaving plants, chemical plants, Jingbian, bomb factory, knitting, silk factory, hosiery and other types of mills. E, suitable for warehousing and logistics