3-10. AIR FILTER MAINTENANCE - Continued.
Do not attempt to clean air filters by brushing off dirt. To do so may damage the filter element.
Clean air filters with a clean water spray.
Allow to dry thoroughly.
Cleaning solvent, Federal specification P-D-680, is toxic and flammable. Use only in a well-
ventilated area. Avoid prolonged breathing of fumes. Keep solvent away from flames. Do not
use in excessive amounts. Avoid skin contact.
Clean filter element and frame with cleaning solvent (item 11, Appendix E) to remove all traces or dirt,
grease, or oil.
Allow to dry.
Inspect frame for cracks, dents, bends, and corrosion.
Inspect element for holes, rips, and tears.
Place air filter (2) into heater unit.
Put top of air filter (2) into upper track.
Swing bottom of air filter (2) rearward and lower into bottom track (3).
Repeat steps (1 through 3) for other filter (1).
Place access cover (4) into position.
Secure with seven quarter-turn fasteners (5).