Optional 4th Stage: Hepa 95% and Carbon filter media. For Odor reduction
To ensure that a HEPA filter is working efficiently, they should be checked and changed at least every six months in commercial settings.
In residential settings, they can be changed every two to three years. Failing to change a HEPA filter in a timely fashion will result in it putting stress on the machine or system and not removing particles from the air properly.
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