According to different application,
there are family humidifier, commerical humidifier,industrial humidifier
etc; According to different work principle, there are centrifugal
humidifier, ultrasonic humidifier, split type humidifier etc. 

  But in mushroom industry, ultrasonic
humidifer is popular and widely used in mushroom growing room. It can
keep 95% humidity and offer a good grow condition for mushroom.