Dilution air refers to:

Dilution air is the term used for air that mixes with combustion gases to ensure safe and efficient venting in a natural draft furnace system. When combustion occurs, gases are produced, and it's essential to control these gases to prevent the buildup of harmful substances. By introducing dilution air, the concentration of combustion gases is reduced, allowing for safer venting through the flue. This process helps to minimize the risk of backdrafts and enhances the overall efficiency of the system.

The focus on dilution air specifically addresses its critical role in maintaining air quality and ensuring the safe operation of heating systems, especially those using natural draft technology.