Evaporative humidifiers operate through the use of a supporter to blow air about a wet wick, pad, or filter. The h2o during the wick evaporates into the air, increasing its humidity. Such a humidifier is self-regulating, as the speed of evaporation decreases as the humidity amount during the air boosts. https://humiditycontrol42197.canariblogs.com/humidity-control-no-further-a-mystery-52952279