Honeywell F50F Owner's Manual page 17

The electronic 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 as well as to
protect the blower, air conditioning coils and
heat exchanger.
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