The duct identification number sometimes includes location on drawings.

• A. False
• B. True
• C. It includes only the scale
• D. It includes the warranty period

Answer: (B)

Duct identification numbers are meant to uniquely identify each run in the system and often carry location information to make installation and coordination easier. In complex projects, knowing exactly where a duct terminates or passes through—such as a specific floor, zone, or room—helps ensure the right duct is built and placed in the correct location, and it allows the drawings, schedules, and shop fabrication data to line up with reality on site. Because of this, it’s common for a duct tag or ID on drawings to include location details in addition to size, material, and service. Of course, on some projects the location may be left to separate room or zone references, but the option that location can be included is correct.