HVAC Journeyman Practice Exam

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What is the maximum length for listed transition ducts for clothes dryers?

3 feet
4 feet
5 feet
6 feet

The correct answer is: 6 feet

The maximum length for listed transition ducts for clothes dryers is established to ensure safe and efficient ventilation of the dryer. Transition ducts, typically made of flexible materials such as aluminum or plastic, are designed to connect the dryer to the venting system. When using transition ducts, a length of 6 feet is permitted because this allows adequate space for airflow while minimizing the risk of lint accumulation, which can pose a fire hazard. Ensuring that the transition duct is not excessively long helps maintain optimal performance of the dryer and prevents excessive back pressure that could reduce drying efficiency. Additionally, the 6-foot maximum is relevant for maintaining effective airflow and minimizing the potential for blockages. Keeping transition ducts within this length also makes it easier to clean and maintain the duct system, further contributing to safety and efficiency.