Answer (1 of 4): Essential oils will damage any rubber parts and may damage your humidifier in other ways as well as spread solvents through the air and you should not be breathing them if you are a cat or an infant or someone with compromised breathing.
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PureGuardian H4810AR Ultrasonic Warm and Cool Mist Humidifier for Bedrooms, Quiet, Filter-Free, 120 Hr, 2 Gal Treated Tank Surface Resists Mold, Pure Guardian Humidifier with Essential Oil Tray : Home
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