Honeywell F52F Owner's Manual page 19

The air cleaner
vs. the standard
furnace filter
The regular furnace filter collects mainly large,
visible particles that reach the filter. Its main
purpose is to protect the furnace and air
conditioner blower. The electronic air cleaner
collects these large particles, plus many of the
smaller, mostly invisible particles. Its purpose is
to reduce indoor air pollution and to protect the
blower, air conditioning coils and heat
exchanger.
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