Where should moisture and combustion products from dryer exhaust systems be conveyed?

Moisture and combustion products from dryer exhaust systems should be conveyed to the outside of the building because this is essential for maintaining indoor air quality and safety. When dryers operate, they expel warm, moist air along with any particulate matter or combustion byproducts. If this air is not directed outdoors, it can lead to increased humidity levels inside the home, which may cause mold growth, damage to structures, and a decrease in air quality.

In addition, the discharge of potentially hazardous combustion products (in the case of gas dryers) into the building could expose occupants to harmful gases, such as carbon monoxide. Thus, venting to the outside not only helps in keeping indoor spaces comfortable but also ensures that any toxic gases are safely eliminated from the living environment. This is why proper installation of dryer exhaust systems, as per mechanical code guidelines, mandates venting outside.