Husqvarna W 100D Operator's Manual page 31

MAINTENANCE
AIR FILTER CLEANING
The engine performance is adversely affected when the air filter element
is clogged with dust. Be sure to clean the air filter element periodically.
air to
Blow air through elements using 0.29 to 0.49Mpa (3.0 5.0kgf/cm
2 )
remove the particulates. Use lowest possible air pressure to remove the
dust without damaging the element.
If either element damaged replace it.
FOAM ELEMENT
AIR CLEANER ELEMENT
29