- As your HR Unit ages and the coil is exposed to airborne particulate, internal parts will eventually get dirty and begin to degrade, which can cause loss of effectiveness over time.

- This happens more quickly in extremely dusty and high-humidity environments.

- You can inspect the internal coil of your HR unit by turning on your HR Unit in a dark room and looking at the coil through the front grille while the HR Unit is running.

- The entire coil should be glowing purple.

- If you see dark spots on the coil, this indicates the areas of the coil that have become dirty—as these dark areas increase, the amount of ozone produced decreases.

- It’s recommended to use a can of moisture free compressed air blown into the front grille on the HR unit to periodically remove dust and debris built up on the inside.

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