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• The absence of a draft in your chimney (indicating
blockage).
• Fallen soot from the fireplace chimney.
• Loose, damaged or discolored bricks on your chimney.
Clues You Cannot See:
• Internal appliance damage or malfunctioning components.
• Improper burner adjustment.
• Hidden blockage or damage in chimneys.
Understand the Effects of Carbon Monoxide Exposure:
Reminder: This chart relates to the exposure of carbon monoxide to
healthy adults.
Carbon Monoxide Safety
Concentration of CO
in Air
50 ppm (parts/million)
200 ppm
400 ppm
800 ppm
1,600 ppm
3,200 ppm
6,400 ppm
12,800 ppm
Approximate Inhalation Time and
Symptoms Developed
The maximum allowable concentration for
continuous exposure for healthy adults in
any 8-hour period, according to OSHA.
Slight headache, fatigue, dizziness, nausea
after 2–3 hours.
Frontal headaches within 1–2 hours, life
threatening after 3 hours.
Dizziness, nausea and convulsions within
45 minutes. Unconsciousness within
2 hours. Death within 2–3 hours.
Headache, dizziness and nausea within
20 minutes. Death within 1 hour.
Headache, dizziness and nausea within
5–10 minutes. Death within 25–30 minutes.
Headache, dizziness and nausea within
1–2 minutes. Death within 10–15 minutes.
Death within 1–3 minutes.
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