Machine using CAD / CAM design, with low investment costs, air volume, low noise, low energy consumption, stable operation, long life, high efficiency, shutters automatically shuts dust, water, nice; to the hair, modern workshop is the best choice for cooling ventilation, but also ventilation. Environmental protection, energy saving ventilation and cooling equipment suction fan will become the mainstream market is the use of suction fan air convection cooling principle of negative pressure ventilation, the installation location of the door or window --- natural fresh air, indoor hot gas Forced quickly exhausted to the outside, any problems can improve poor ventilation machines, ventilation cooling effect of up to 90% -97%. Suction fan - a cooling principle, ventilation cooling: As sunlight buildings, machinery and equipment, such as body heat resulting in the need ventilated place higher than the outdoor temperature. Suction fan of indoor heat can be quickly discharged, so that temperature and the outside temperature was flat, and will not shop inside temperature. Second, the air flow away body heat, air flow to accelerate the evaporation of sweat and the heat absorbed by the body, thus allowing the body to feel cool, and natural, like the wind cool. Third, the only negative pressure ventilation fan cooling effect, there is no cooling function, the body cool feeling. Suction fan can lower the temperature to say how many are ignorant. Four, and the curtain with the use of the hottest in the summer when the temperature can be controlled within the workshop 28 degrees Celsius. But the human body can be compared with the air conditioning cool feeling, a little in front of the curtain of time people will feel cold and stand outside the plant vacuum exhaust fan indoor air pressure falls, indoor air thinned to form a negative area, the air flows into the interior of compensation due to the pressure difference. In practical applications, industrial plants, plant negative pressure exhaust fan installed in the plant to focus on one side, the air intake to the plant room on the other side, the air intake by mouth suction fan convection hair. In this process, the suction fan near the doors remain closed, forcing air to flow from the air inlet side shop windows compensation. Air lined up orderly inflow from the air inlet workshop, from workshop flow, negative pressure ventilation fan discharge from the plant shop. Ventilation thorough, efficient ventilation rate can be as high as 99%. Through specific engineering design, according to the need to design ventilation rate and wind speed, any fever, harmful gases, dust can quickly exhaust smoke shop, any disposable poor ventilation can solve the problem. From a few seconds to turn on the exhaust fan ventilation can achieve results. Negative pressure ventilation fan cooling system: investment in just one-third of the cost of air conditioning, air conditioning running costs only one-tenth, it has air-conditioning cooling effect; low-cost, high effect! Fan Features: high pressure, air volume, low noise, low energy consumption, smooth operation and long life; shutters automatically open and close, dust, water, nice; with ventilation, ventilation, dust, hot solution, in addition to taste go electrostatic cooling in one set. 1, less investment, performance. 2, low power consumption, power consumption is only 1 degree per hour. 3, and the displacement of up to an hour to send 44,500 m3 cold, air volume, the effect is good. 4, ventilation, ventilation, dust, odor, cooling rolled into one. 5, increasing oxygen content, improve work efficiency. 6, easy maintenance and easy cleaning.