Where does dilution air join the combustion air byproducts, and what is this air called?

Dilution air joins the combustion air byproducts at the draft diverter, and this combined air is referred to as secondary air. The draft diverter plays a critical role in ensuring that the products of combustion are safely vented outside while allowing for the proper mixing of outside air (dilution air) with the combustion gases. By adding dilution air, the goal is to reduce the concentration of harmful gases before they're released into the atmosphere, thus improving safety and efficiency.

Combustion appliances can produce harmful byproducts, and the draft diverter helps to manage these by allowing dilution air to mix in and effectively reduce these concentrations. This is important for maintaining indoor air quality and ensuring that combustion processes operate safely without causing backdrafting or other issues associated with poor ventilation.