What is the purpose of dilution air in a flue system?

Dilution air in a flue system primarily serves the purpose of controlling condensation. When combustion gases are vented, they can contain various levels of moisture depending on fuel type and combustion efficiency. When these gases cool down too quickly within the flue, moisture can condense on the walls of the venting system, leading to potential damage and corrosion over time. By introducing dilution air, the temperature of the flue gases can be maintained at a higher level, which helps to keep the moisture in vapor form, thus preventing condensation.

Maintaining the right temperature helps safeguard the integrity of the flue system and ensures that the exhaust gases are expelled appropriately without adverse effects on the system or the environment. This controlled relationship between temperature and moisture content is crucial in extending the lifespan of the venting system and promoting safe operation.