What is the recommended diameter for a clothes dryer duct?

The recommended diameter for a clothes dryer duct is 4 inches. This standard is in place because a 4-inch diameter duct effectively balances airflow and minimizes resistance, allowing the dryer to exhaust moisture and air efficiently during operation.

A duct with this diameter is also aligned with standard dryer vent fittings and connections, simplifying installation and maintenance. This size helps to prevent lint buildup, but it is substantial enough to accommodate the volume of air expelled from most residential dryers. Furthermore, larger ducts can introduce unnecessary space that may lead to insufficient airflow and increased energy usage, while smaller ducts can severely restrict airflow, causing longer drying times and potential overheating. Thus, a 4-inch diameter is optimal for safety and efficiency in dryer ventilation.