Where are exhaust systems permitted to discharge air?

Exhaust systems are specifically designed to expel contaminants, odors, and moisture from indoor environments to maintain air quality and safety. Discharging exhaust air outdoors is essential to ensure that harmful materials do not circulate back into the indoor living spaces. This outdoor discharge helps protect the health of occupants and prevents the buildup of harmful gases or volatile organic compounds inside buildings.

Discharging exhaust air indoors, into basements, or into attics is generally not permissible because these areas are often less ventilated, which could lead to a concentration of pollutants and moisture, causing potential health risks and structural issues, such as mold growth. Proper ventilation and air exchange require that exhaust air be expelled to the outside, ensuring a safe and healthy environment within the building.