American Dryer Corp. ADH-120 - Manual (Page 34)

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2. Filter Replacement
The frequency at which filters have to be replaced is best determined by each location.
a. Verify main door is closed (this is to eliminate contamination of clean room).
b. Discontinue electrical power to the dryer.
c. Remove filter access cover plate.
d. Remove pre-filters.
e. Remove HEPA filters.
f. Replace both HEPA and pre-filters.
g. Reinstall filter cover plate.
h. Perform any necessary scrubbing of the dryer.
i. Reestablish electrical power to the dryer.