A possible treated filter cassette absorbs the water from the water tank. Fans convey dry air through these soaked filter cassettes and blow the humidified air back into the room. The humidification is not visually visible. A grosser ability of an evaporator system is that over-humidification is not possible. Saturated air is not treated further with this system and this is how the performance is managed. Advanced evaporator humidifiers very little electricity and work extreme conditions.