Exams / HS&E HAPS / Gas appliances, flues and leaks / Question 3

HS&E HAPS practice question: Gas appliances, flues and leaks (3 of 5)

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

Last verified October 2026 against HSE guidance and the law ·How we write our questions

During a refit, a builder wants to box in a boiler flue to make the room look tidy.

What does HSE say?

Choose one answer.

A. Box it in neatly
B. It is fine if the boiler is only used in winter
C. Fine with a window open
D. Don't obstruct flues and chimneys

Show the answer and explanation

Answer: D

A. Wrong: Wrong. Flues must not be obstructed.
B. Wrong: Wrong. Flues must not be obstructed at any time.
C. Wrong: Wrong. Flues must not be obstructed.
D. Right: Right. HSE says don't block air inlets or obstruct flues and chimneys for gas appliances.

Explanation

Never obstruct flues, chimneys or air inlets for gas appliances.

Study

HSE: Gas safety for employers

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