Our technical support team can assist you should you have any questions about your Lennox humidifier or Lennox air cleaner. Order from the source of Lennox humidifier parts and air cleaner parts just like the contractors do. You will find on-line owners manuals as well as exploded views of your model on its associated humidifier parts page. Remember to replace your Lennox humidifier filter or humidifier pad at least once per year for optimal operation. Lennox air cleaner filters need replaced at least once per year if you only have heating and twice per year if you have heating and air conditioning.