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When installing a furnace plenum, the primary requirement is to adhere to building codes. Building codes are established standards that ensure safety, health, and efficiency in construction and installation practices. These codes dictate the specifications for materials, installation practices, clearances, and other important factors that must be followed to ensure a safe and functional HVAC system.

Following building codes ensures that the installation is compliant with local regulations, which can prevent potential fines or required rework. They also provide guidelines for aspects such as pressure ratings and air flow requirements that can significantly affect the performance of the heating system.

While considerations such as the size of the plenum in relation to the furnace outlet, compatibility with existing ductwork, and local ventilation guidelines are important aspects of the installation process, they all fall under the broader umbrella of compliance with building codes. Ensuring that the installation meets these codes is critical for not only legal compliance but also for the efficiency and safety of the HVAC system.