Friedrich C-90, C-90A and C-90B Air Cleaner Replacement Pre-FilterOccasionally, the pre-filter
will require replacing. Often, just a good cleaning will suffice. To clean the pre-filter, remove the pre-filter and
shake out or brush off the accumulated dust and lint. If this is not adequate,
a vacuum may be used or the pre-filter can be cleaned with an all purpose
detergent based cleaner to remove tobacco smoke and cooking grease stains.
A thorough rinsing is required after each cleaning. After cleaning, allow
to dry and reinsert. When the filter becomes worn or damaged, it should
1. The C90 PRE-FILTER catches the larger particles as room air is drawn
through the rear grille.
2. In the IONIZING SECTION of the ELECTRONIC CELL, billions of microscopic
particles become electrically charged as they pass through a powerful
3. COLLECTOR PLATES immediately attract these "charged" particles.
4. Finally, an activated CARBON FILTER removes most common odors
and fumes as the "clean air" is circulated back into the room.
The C90A has been rated the #1 air cleaner in the US by a leading consumer magazine.