Carbon Monoxide from Chimneys – What You Must Know
Published on January 5, 2026 • 7 min read
Carbon monoxide (CO) is a colorless, odorless gas that can be produced by incomplete combustion in chimneys. Exposure can be fatal, and many homeowners are unaware of the risks.
Why CO is Dangerous
- Silent Killer: No smell or taste, making it hard to detect.
- Health Effects: Headaches, dizziness, nausea, and in high concentrations, death.
- Common Sources: Faulty chimneys, blocked flues, and poor ventilation.
Symptoms of CO Poisoning
Early symptoms often mimic flu-like illness, which can lead to misdiagnosis. Look for:
- Headache
- Dizziness
- Nausea or vomiting
- Shortness of breath
- Confusion or loss of consciousness
Prevention & Safety Measures
- Annual Chimney Inspection: Have a certified professional inspect and clean your chimney each year.
- Install CO Detectors: Place detectors near sleeping areas and on each level of the home.
- Ensure Proper Ventilation: Keep vents and flues clear of debris.
- Use Quality Fuel: Burn dry, seasoned wood to promote complete combustion.
- Never Use Outdoor Appliances Indoors: Portable heaters and grills can produce CO.
What To Do If CO Is Detected
Immediately evacuate the home, call emergency services, and get a professional inspection before re‑entering.