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6. Maintenance
6.1. Cleaning the Advance unit
outside covers
Keep the unit surface free from dust.
6.2. Filter replacement
For the user, maintenance is limited to
cleaning and replacing the filters.
These will need to checked annually and
either cleaned or replaced.
This may differ per situation depending on
environmental pollution from industry or
traffic and also the activities in the house.
A) Remove the plastic cover.
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