Pure Breeze HEPA Air Purifier/Fume Hood

Stage 1 Pre-Filter (P/N 97021): every three months.
Stage 2 Secondary Filter (P/N 97022): every three Pre-Filters (or, every nine months).
Stage 3 Charcoal Odor Filter (P/N 97023): when noticeable odor returns.
Stage 4 HEPA Filter (P/N 97024): every twelve months.

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