Airtecnics Kleenbox 46/46, Installation, Operation And Maintenance Manual

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The G4 and F7 filters can be removed by pulling them once the service panel is removed:
G4 Filter F7 Filter
After removing the G4 and F7 filters, there is enough space to take off the H14 filter. This one is fixed to the
housing by four wing nuts that should be untighten before remove the filter:
HEPA H14 Filter
To place the filters inside the equipment, follow the same steps but in reverse order: first, HEPA H14 filter,
secondly, F7 filter; and, the last one, G4 filter. Finally, close the service panel and close it using the key.