Which of the following is NOT a type of APC nozzle?

• A. Plenum
• B. Appliance
• C. Duct
• D. Nozzle

Answer: (D)

APC nozzle types are categorized by where they’re installed in the system. The named types reflect specific installation locations—plenum, appliance, and duct—each indicating a distinct place where the nozzle is used and how it interacts with the surrounding air or flow. The term “Nozzle” by itself is just the generic word for a nozzle and does not designate a particular APC installation. Because it lacks a specific location, it isn’t considered a distinct APC nozzle type. So the option that isn’t an APC nozzle type is the generic term for a nozzle.