prevent the passage of air through the filter material.
Inspect the filter for cuts, tears or other
damage which would permit the passage of unfiltered air
through the filter material.
Inspect the filter frame assembly for
security of attachment and proper mounting.
Inspect filter for correct insertion into filter
replacement or cleaning of the filter is necessary,
remove the unit as follows:
Open the hinged exterior weather cover
by releasing the fasteners. Secure the cover in the
open position by means of the bracket-hinged retaining
rod. (See fig. 4-30.)
Figure 4-30. Shelter Door Air Filter, Removal and