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How often should a chimney be cleaned?

Short answer

Have it inspected at least once a year and cleaned when needed. That’s the national fire safety standard (NFPA 211). If you burn a lot of wood, you may need cleaning more often.

Rules differ by state. This is general information, not legal or professional advice.

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Official sources

U.S. Fire Administrationusfa.fema.gov
NFPA: fire safetynfpa.org