What is the maximum specified length of a domestic clothes dryer exhaust duct?

The maximum specified length of a domestic clothes dryer exhaust duct is 35 feet. This measurement is critical because it ensures that the dryer operates efficiently and safely. Longer ducts can lead to increased resistance to airflow, which may cause the dryer to work harder, potentially resulting in longer drying times and increased energy usage. Additionally, longer exhaust ducts can also be more prone to lint buildup, which increases the risk of fire hazards.

To maintain optimal dryer functionality and safety, manufacturers typically provide installation guidelines that suggest both the maximum length of the ductwork and the number of bends it can have. A duct that exceeds the recommended length may not vent properly and could necessitate more frequent maintenance and cleaning to prevent lint accumulation. Therefore, a maximum length of 35 feet provides a balance between flexibility in installation and the effectiveness of lint removal from the dryer.