How is a projected beam detector inspected?

For inspection purposes (not testing), projected beam detectors arevisually checkedforobstructions, alignment issues, and cleanlinessof lenses.

NFPA 72 (2022), Table 14.3.1 — Inspection Frequencies:

“Projected beam smoke detectors” → Inspect quarterly

Method: Check for obstruction, alignment, cleanliness

Testing uses an optical filter, butinspectionis visual.

Correct answer: A. Check for obstruction

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