Husqvarna Rider ProFlex 21 Operator's Manual page 41

3. Remove the foam rubber pre-filter and clean using
a mild detergent.
Squeeze it dry with a clean cloth.
4. Remove the wing nuts for the air filter and remove
the paper filter.
5. Tap the paper filter against a fixed surface to
remove dust.
If the paper filter is still dirty, it must be replaced.
IMPORTANT INFORMATION
Do not use compressed air to clean the paper
filter.
Do not wash the paper filter.
Do not oil the paper filter.
6. Refit the air filter as follows:
Check that the seal on the bottom of the paper
filter is whole. Fit the paper filter in the air filter
housing and tighten the wing nuts.
7. Refit the pre-filter on the paper filter.
8. Replace the cover over the air filter housing.
Do not over tighten the plastic fasteners.
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