The maximum length of a domestic dryer exhaust duct is __________ feet.

The maximum length of a domestic dryer exhaust duct is indeed specified in the International Mechanical Code. The correct answer is based on the requirement that a dryer duct should not exceed a maximum length of 35 feet for effective ventilation. This limit ensures that the exhaust can flow freely and efficiently without accumulating lint or causing back pressure, which could lead to operational issues or fire hazards.

In practice, as the length of the duct increases, the resistance to airflow also increases due to friction against the duct walls and potential bends in the ductwork. Therefore, maintaining the length at or below 35 feet is crucial for optimal performance and safety. Additionally, if the duct is longer than this specified length, manufacturers may require additional measures, such as the use of more powerful exhaust fans or shorter run configurations, to achieve effective drying and to minimize hazards. Hence, 35 feet is established as a standard maximum length for residential dryer exhaust ducts in the IMC.