21D28-6 - Evaporative Cooling Thermostat & Control BoxWhite Rodgers 21D28 6 Evaporative Cooling Thermostat & Control Box Functions as a switching device for the thermostat to provide an even level of cooling plus a choice of high and low speed control of the fan on evaporative coolers. Features Grey plastic case is lightweight, weather resistant and meets all code requirements Fully automatic, system designed with a fan delay (approximately 60 seconds) to prewet the cooler pads before the fan start
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21D28-6 - Evaporative Cooling Thermostat & Control Box