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The function of negative pressure fan: 1, used as exhaust ventilation: installed in the shop window, generally choose downwind, outward exhaust, take out odor gas: generally used in chemical plants, etc. 2, with the use of wet curtain: used for workshop cooling hot summer, no matter how hot your workshop, wet curtain - negative pressure fan system can make your workshop temperature down to about 30℃, and has a certain humidity. 3. Scope of application: A, suitable for high temperature or odor workshop. B. Applicable to labor-intensive enterprises. C. Ventilation and cooling of horticultural greenhouses and property cooling. D, especially suitable for places that need cooling and certain humidity. E. Applicable to warehousing and logistics