Miele S 4002 - Manual (Page 26)

Replacing the exhaust filter
Depending on model, the vacuum
cleaner will be equipped with one of the
following exhaust filters:
a Air Clean filter
b Active Air Clean filter
c Active HEPA filter
"Air Clean" filter
An "Air Clean" filter is supplied with
every box of Miele dustbags. It should
be replaced each time a new box of
bags is started.
"Active Air Clean" or the "Active
HEPA" filter
An "Active Air Clean" or "Active HEPA"
filter should be changed approximately
once a year. Change the filter sooner if
it is obviously soiled or no longer
effective.
It is helpful to note the date directly on
the filter as a reminder for when to next
change it. See "Optional Accessories"
for filter descriptions.
Maintenance and care
26