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When you think of hydroponic equipment, hydrophonic fans may not be the first thing that pops into mind. Fans are important to hydroponics, though, not only to circulate air for the plants, but also to keep the lights cooled.

Fans also respond to the thermostat in a hydroponic system to provide temperature control. The lights are hot and bright, and you need to keep the heat constant, so make sure the fans are in working order.