An engineer inspects an older, open-flued gas boiler. The boiler itself is in good working order and passes a flue flow test, but it is installed in a room where the homeowner has recently fitted a powerful mechanical extractor fan without any additional purpose-provided ventilation. How should the engineer classify this situation according to the Gas Industry Unsafe Situations Procedure (GIUSP)?
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A
Immediately Dangerous (ID), as the fan will cause spillage when operated.
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B
At Risk (AR), because a potential danger exists when the fan and boiler operate concurrently.
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C
Not to Current Standards (NCS), as the ventilation was likely adequate before the fan was installed.
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D
Not Unsafe, provided a warning notice about using the fan is issued to the homeowner.