The Clean Air Flow filtering unit installed.

The prefilters have not been changed since installation, an order for a new set of prefilters will be made to change them. !!!!!!!!!

For regular maintenance:

The Prefilters must be cleaned every 3 - 6 months, depending on their condition.

The process is to clean them by handwashing in water with a mild detergent or by using a vacuum cleaner.

Allow prefilter to dry completely before replacing.