8. Inspect the folds of the filter, following the direction of the fold to try to detect holes, which may be
small and hard to see.
Inspect both sides of the filter media following this checklist:
a. Inspect along the folds of the media, following the direction of the fold with your eyes to detect
if ther
e are holes. The holes are often small and not immediately clear. Care should be taken
during inspection.
b. Inspect the media near the filter sides. Damage of the media is common here and is more
difficult to see as the view is obstructed by the lips of the filter frame.
Clean the top-enclosure left and right fan filters 183
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