Which two describe an air sampling smoke detection system? (Choose two.)

Question

Options

• AIt is made up of a network of pipes.
• BIt uses magnetic resonance imaging.
• CIt is generally located in wiring closets.
• DIt automatically compensates for changing environments.

• A
  72% (44)
• B
  8% (5)
• C
  16% (10)
• D
  3% (2)

Explanation

Air sampling smoke detection (ASSD) systems work by drawing air through a network of pipes installed throughout a building - that air is then analyzed at a central detection unit, making A correct. Note that the question says "choose two," and D is also correct: advanced ASSD systems (like VESDA) continuously adjust their sensitivity thresholds to account for environmental changes such as dust buildup or humidity, preventing false alarms.

Why the distractors are wrong:

• B (MRI) - Magnetic resonance imaging is a medical/imaging technology with no relation to fire detection; ASSD uses laser-based particle analysis.
• C (wiring closets) - ASSD is typically deployed in large open spaces, data centers, or warehouses where early detection is critical, not confined to wiring closets (that's more typical of spot-type detectors).

Memory tip: Think of ASSD as a vacuum cleaner for smoke - it actively pipes air to a sensor and is smart enough to adapt. Pipe + Adapt = the two key traits. If an answer involves passive detection or a specific confined location like a closet, rule it out.

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