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41481-01 10-5-2001 9
®
CHANGING THE PRE-FILTER
In a typical environment, the pre-filter should be changed every 2000
hours (approximately 3 months of use) to maintain proper odor-removing
capability and overall filtration performance. Changing the pre-filter
regularly will also help extend the life of the HEPA filter. If necessary, the
pre-filter can be changed more frequently. The following instructions tell
you how to change the pre-filter.
For Models 36144, 36145, 36259, 36260, 36394, 36395: The pre-filter
indicator will flash after 2000 hours of use as a reminder that you should
change the pre-filter.
1. Turn OFF and unplug the air purifier.
2. Remove the front grille to expose the pre-filter. The pre-filter is
attached to the front grille with hook tape. Pull gently on the pre-
filter to remove it. Once removed, you can dispose of the used pre-
filter.
3. If needed, use a soft damp cloth to wipe off the front grille.
4. Remove the new pre-filter from the plastic wrapping and install it in
the grille by pressing gently on the corners where it adheres to the
hook tape. You may notice a few black particles coming off the pre-
filter. Those particles are part of the odor-removing activated carbon
and will be collected on the filter during normal use. Mark the new
filter installation sticker included with the pre-filter and place the
sticker on the front grille for future reference.
5. Install the front grille onto the unit and plug in the air purifier.
6. For Models 36144, 36145, 36259, 36260, 36394, 36395: Reset the
pre-filter counter as described in the Pre-filter and Filter Counter section
of this manual.
CHANGING THE HEPA FILTER
Although the proper time to change the filter depends on usage and the
environment, a typical life is 8000 hours (approximately 1 year of usage).
If you notice a decrease in air output or an increase in noise at any time
during normal operation, the filter may be clogged and need to be
replaced. A color-coded chart is also included on the inside of the housing
to help you determine if it is time to change the HEPA filter. Follow these
instructions to change the HEPA filter.
For Models 36144, 36145, 36259, 36260, 36394, 36395: The filter
indicator will flash after 8000 hours of use as a reminder that you should
change the filter.
1. Turn OFF and unplug the air purifier.
2. Remove the front grille and gently pull on the filter to remove it from
the unit. While removing the filter, note the direction of the flaps
that form the seal around the filter. The new filter will be installed
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