HVAC Journeyman Practice Exam

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When installing a furnace plenum, what is the primary requirement?

Must be larger than the furnace outlet
Must adhere to building codes
Should follow local ventilation guidelines
Must be compatible with existing ductwork

The correct answer is: Must be larger than the furnace outlet

The primary requirement when installing a furnace plenum is that it must adhere to building codes. Building codes are put in place to ensure safety, efficiency, and compliance with local regulations regarding the installation of HVAC systems. These codes cover various aspects, including materials used, installation methods, and sizes for components like plenums, which are critical for proper airflow and operation. Choosing to make the plenum larger than the furnace outlet, while it may ensure better airflow, does not take into account other crucial factors like compliance with safety regulations and dimensional requirements established in building codes. Following local ventilation guidelines is important but may fall under the broader category of building codes. Compatibility with existing ductwork is necessary for a seamless installation and optimal performance, but that consideration alone does not encompass the primary legal and safety requirements. Therefore, adhering to building codes takes precedence in ensuring the overall integrity and legality of the installation.