Carbon Monoxide and Your Chimney: What DFW Homeowners Must Know

The Silent Killer in Your Home

Carbon monoxide (CO) is an odorless, colorless gas produced by burning fuels including wood, gas, and oil. When your chimney or venting system is compromised, CO can enter your living space instead of being safely vented outside.

How Chimneys Cause Carbon Monoxide Problems

Blocked or Dirty Flues

Creosote buildup, animal nests, or debris can partially or fully block the flue, preventing proper venting of combustion gases.

Cracked Flue Liners

Cracks in clay tile or deteriorated metal flue liners allow CO to seep through the chimney walls into your home.

Negative Air Pressure

Modern, tightly sealed DFW homes can create negative air pressure that pulls CO down the chimney instead of up and out.

Closed or Stuck Dampers

A damper that won’t open fully restricts airflow and can trap CO in your home.

Improper Fireplace Use

Closing the damper before the fire is completely out traps CO in the home as embers continue to produce carbon monoxide for hours.

Carbon Monoxide Symptoms

CO poisoning symptoms are often mistaken for the flu:

Mild Exposure:

• Headache
• Dizziness
• Nausea
• Fatigue

Moderate Exposure:

• Severe headache
• Confusion
• Rapid heart rate
• Impaired judgment

Severe Exposure:

• Loss of consciousness
• Seizures
• Death

Critical Warning: If symptoms improve when you leave the house and return when you come back, suspect carbon monoxide.

CO Detector Placement for Homes with Fireplaces

• One detector on every level of the home
• One detector within 15 feet of every sleeping area
• One detector near the fireplace (but not directly above it)
• Do NOT place detectors in the kitchen, garage, or bathroom (false alarms)
• Replace detectors every 5-7 years
• Test monthly, replace batteries annually

Prevention for DFW Homeowners

1. Annual chimney inspection and cleaning – removes blockages and identifies flue damage
2. Install CO detectors – on every level and near sleeping areas
3. Never close the damper on a burning fire – wait until ashes are completely cold
4. Ensure proper ventilation – crack a window if the house is very tightly sealed
5. Never use a generator or grill indoors or in the garage

What to Do If Your CO Detector Alarms

1. Do NOT ignore it
2. Get everyone out of the house immediately
3. Call 911 from outside
4. Do NOT re-enter until emergency services clear the home
5. Schedule a chimney and heating system inspection before using the fireplace again

Blue Flue Solutions provides chimney inspection focused on carbon monoxide safety throughout Dallas-Fort Worth. Call or Text (469) 207-1203.