Emergency Response to Indoor Smoke from Chimney Backdraft

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Checklist Tasks

• Extinguish the fire in fireplace or stove to stop further smoke production.
• Open windows and exterior doors to ventilate smoke and lower CO risk.
• Close interior doors to rooms not affected to contain and control smoke spread.
• Check the damper to ensure it is fully open and smoke can exit freely.
• Inspect the chimney cap and flue outside for nest, debris, or ice blockages.
• Turn off exhaust fans, range hoods, and HVAC to prevent negative pressure indoors.
• Feel for cold drafts near the fireplace to assess reverse airflow.
• Use a flashlight to look up chimney for visible obstructions or liner collapse.
• Test carbon monoxide detectors to ensure they function and have not been triggered.
• Document timing, outside conditions, and appliance use for diagnosis.
• Do not relight the fireplace or stove until a certified sweep inspects the flue.
• Clean up soot from hearth and furnishings promptly to avoid permanent stains.