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HS&E DUCT practice question: Isolating fans and plant (1 of 5)

E. Specialist: HVACR – ductwork A free question from our original HS&E DUCT practice exam. Try it, then open the answer to see why each option is right or wrong.

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You need to clean the inside of a duct next to an air handling unit fan.

What must happen first?

Choose one answer.

  1. A. Reach in while it spins slowly
  2. B. Turn it down to the lowest speed
  3. C. Ask someone to stand and watch the switch for you
  4. D. Stop the fan and isolate it
Show the answer and explanation

Answer: D

  • A. Wrong: Wrong. Moving plant must be stopped and isolated.
  • B. Wrong: Wrong. Moving plant must be stopped and isolated.
  • C. Wrong: Wrong. Isolate the power.
  • D. Right: Right. HSE says ensure moving plant has stopped and isolate electrical and other power supplies before maintenance.

Explanation

Before working on fans or plant, stop them and isolate the power.

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