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Humidity controls from Grainger provide a user-set dew point control of humidification, dehumidification or ventilation equipment. Selection includes wall mount and return duct mount styles, plug in outlets and plug in outlet with piggyback. Ranges adjust from 5 to 95%, 10 to 60%, 20 to 80% and 30 to 90% relative humidity (RH). Choose the size and style that fits your application. You'll find the brands you know and trust when you shop for a humidity control switches at Grainger.