Open duct sections are stored on a muddy site, and the crew plans to install them without end protection or cleaning. What should be corrected?
Correct Answer
B) Protect duct openings and clean contaminated sections before installation
Duct systems should be protected from construction debris and cleaned when contaminated before installation or startup. Other choices move contamination into the system rather than preventing it.
Why This Is the Correct Answer
Duct systems should be protected from construction debris and cleaned when contaminated before installation or startup. Other choices move contamination into the system rather than preventing it.
Why the Other Options Are Wrong
Option A: The crew should install dirty duct and change filters later
The trap in A is Install dirty duct and change filters later. That selection is wrong because it leaves out the controlling Duct cleanliness result: Protect duct openings and clean contaminated sections before installation.
Option C: Spray fragrance into the duct after startup
Choice C (Spray fragrance into the duct after startup) is rejected because the option does not produce the required Duct cleanliness outcome, Protect duct openings and clean contaminated sections before installation.
Option D: The crew should leave access panels open during balancing, leaving duct cleanliness unverified
In mechanical and plumbing, Leave access panels open during balancing is the wrong selection for Duct cleanliness: it points to Leave access panels open during balancing, but.
Memory Technique
Pair duct cleanliness with the real field trigger, then choose the response that produces Protect duct openings and clean contaminated sections before installation.
Reference Hint
Open Mechanical and Electrical Systems for Construction Managers, 4th Ed., 2024; use the index entry or section for "HVAC duct storage and cleanliness" to confirm that Duct systems should be protected from construction debris and cleaned when contaminated before installation or startup.
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