GeneralAire’s new Wi-Fi capable humidistat features all the benefits of the GFX4, with an upgraded software and connectivity to our brand new GeneralAire app. The GFX5 is a universal Wi-Fi technology device. It can be used on any brand/model of humidifier, and replace a standard non-Wi-Fi Manual or Automatic Humidistat. This includes units from Aprilaire, Condair, Honeywell, Nortec among many others.