Humidifier W/Permawick Filter 3.5 Gallon Square Foot Coverage: 1600 * Provides 100% protection against bacteria mold and spores with its triple action protection * Permanent filter never needs replacement * Auto shut-off: shuts off when the tanks empty * Refill light signals that the humidifier needs to be refilled * Adjustable humidistat automatically maintains your desired humidty level * Whisper quiet Hunter® Fan * 2 speeds to control moisture output * Airtight Tote AwayTM Tank - simplifies filling * 5 year limited motor warranty *