HVAC Journeyman Practice Exam

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Factory-made air ducts should not be used for vertical risers serving more than how many stories?

1 story
2 stories
3 stories
Occupancy

The correct answer is: 2 stories

Factory-made air ducts are designed under specific manufacturing and testing standards, primarily to handle horizontal runs and ventilation requirements. When it comes to vertical risers, particularly in multi-story buildings, the implications for airflow, structural integrity, and fire safety become significantly more complex. Using factory-made ducts for vertical risers that serve up to two stories is typically acceptable, as this configuration is manageable regarding pressure drops and potential vibrations. However, extending these ducts to more than two stories poses risks. The weight of the ductwork, alongside the potential for condensation and increased pressure differential, can lead to installation challenges and system inefficiencies. Additionally, from a fire safety perspective, vertical ducts in high-rise applications need to endure greater scrutiny to prevent smoke and fire spread. Thus, the limit on the use of factory-made air ducts for vertical risers is generally set at two stories to ensure that the system operates safely and efficiently while adhering to industry standards. This reflects a balanced consideration of functional requirements and safety regulations in HVAC design and installation.