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 humidifier filter or evaporator pad at least once per year for optimal operation. If you have a Generalaire air cleaner you must replace the air cleaner media 2 times per year if you have heating and cooling and once per year if you only have heating. Activated carbon media must be replaced at least 2 time per year.