Combustion Gases
Definition and meaning of Combustion Gases in real estate.
Combustion gases are the gaseous byproducts, including carbon monoxide and water vapor, generated when fuel-burning appliances consume natural gas, oil, propane, or wood.
In more detail
Appliances such as furnaces, water heaters, and fireplaces generate these gases as they operate, making a reliable venting system essential for safety. A flue or chimney must safely direct these emissions outside the home to prevent them from entering the living space. If a venting system is blocked, damaged, or improperly installed, combustion gases can spill back into the home, posing severe health hazards like carbon monoxide poisoning.
Home inspectors regularly check venting systems for drafts, rust, and compliance with local safety codes to ensure these gases are properly expelled.
Key facts
| Category | Property Types & Construction |
|---|---|
| Key Hazards | Carbon monoxide poisoning and moisture buildup |
| Venting Channels | Flues, chimneys, and direct-vent pipes |
| Common Sources | Furnaces, boilers, water heaters, and fireplaces |
A home inspector used a specialized meter near the gas water heater to confirm that no harmful combustion gases were backdrafting into the utility room.
Frequently asked questions
What is backdrafting of combustion gases?
Backdrafting occurs when exhaust gases are pulled back into the living space instead of escaping through the flue, often caused by negative air pressure or blocked vents.
How do you prevent combustion gas leaks?
Homeowners should have fuel-burning appliances inspected annually, keep flues clear, and install carbon monoxide detectors on every level of the home.