Subaru 2009 Impreza Owner's Manual page 177

4-14
Climate control
3. Replace the air filter element with a
new one.
CAUTION
The arrow mark on the filter must
point UP.
4. Reinstall the glove box, and connect
the damper shaft.
5. Close the glove box.
6. LABEL installation
(1) Attach the service label to the
driver's side door pillar.
1) Caution label
(2) Attach the caution label next to the
air filter as shown in the illustration.