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Give it purpose - fill it with water filters, air filters, refrigerator filters, and more.
The Honeywell YTHM5421R1010 can be used in the following applications:
The Honeywell 2-Duct Sensor Equipment Interface Module controls up to four stages of heat and two stages of cool in a heat pump system and up to three stages of heat and two stages of cool in a conventional system. This vertical mount EIM kit includes three sets of Universal IAQ contacts to control humidification, dehumidification, and ventilation and four sensor inputs for wired sensors or dry contact devices.