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 typically 35 feet. This limitation is established to ensure adequate airflow and proper ventilation, which are critical for the safe and efficient operation of the dryer. If the duct is too long, it can lead to increased resistance to airflow, causing the dryer to work harder to expel moisture. This can result in longer drying times, higher energy consumption, and may also pose a risk of lint buildup, which can increase the likelihood of a fire hazard.

Additionally, proper installation guidelines recommend that the duct be as straight as possible, with the fewest turns or bends to minimize airflow resistance. When assessing dryer vent installation, it's important to adhere to local building codes and the manufacturer's recommendations for duct length to ensure both performance and safety are maintained.