In the negative pressure ventilation cooling mode, suction fan for the indoor dirty, hot air is pumped away, and the installation of wet curtain wall on the opposite side of the negative pressure blower is used for air intake. Outdoor fresh air through the wet curtain wall in hot wet pores, and heat exchange occurs by filtration and cooling water.

The origin of the name; because it is usually installed in the factory, Internet bar, the greenhouse walls, similar to the wall, so called wet curtain wall.

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