Why is HEPA Air Cleaner Emitting White Dust?

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Hope somebody out there can tell me why my old Honeywell via Sears HEPA air cleaner is emitting white particles all of the same size. Although the pre-filter is new, it was in package for 9-12 months since I bought it. Is pre-filter a lemon, HEPA filter worn out (can be replaced) or is it time to junk the whole machine? Hate to waste the money on parts if machine needs to go.

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