HVAC Journeyman Practice Exam

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What type of duct connection is prohibited for exhaust systems?

Metal screws
Draw bands
Solder
Flexible material

The correct answer is: Solder

In exhaust systems, the use of solder for duct connections is prohibited due to safety and performance concerns. Solder, which is a melting metal alloy used to join metal pieces, can potentially fail when exposed to the high temperatures that exhaust systems often experience. Over time, the heat can compromise the integrity of the solder joint, leading to leaks. This not only diminishes the effectiveness of the exhaust system but can also pose safety hazards, including the risk of fire or the release of harmful gases into the environment. In contrast, other connection methods such as metal screws, draw bands, and flexible materials are generally acceptable for exhaust applications. Metal screws provide a strong mechanical bond, draw bands allow for a flexible connection that can accommodate movements without compromising the seal, and flexible duct materials can facilitate easier installation while maintaining the necessary airflow and pressure requirements. Therefore, the use of solder in exhaust systems is specifically restricted to ensure both the reliability and safety of the system.