NFPA Exam CFI-I Topic 3 Question 12 Discussion

Actual exam question for NFPA's CFI-I exam

Question #: 12
Topic #: 3

[All CFI-I Questions]

Which of the following conditions must be considered when determining the spacing and location of smoke detectors?

I . Ceiling height

II . Detector sensitivity

III . Ambient environment

IV . Ventilation or airflow

AI and IV

BII and III

CI, III, and IV

DI, II, III, and IV

Show Suggested Answer

Suggested Answer: D

The proper spacing and placement of smoke detectors are critical to their effectiveness. These factors are addressed in NFPA 72, National Fire Alarm and Signaling Code.

Ceiling height (I): Ceiling height affects smoke behavior. Higher ceilings allow smoke to cool and stratify, delaying detection. Adjustments must be made for ceilings greater than 10 feet.

Detector sensitivity (II): Smoke detector sensitivity determines how quickly it responds to smoke. Placement must account for conditions that may impact its performance.

Ambient environment (III): Environmental conditions such as temperature, humidity, and dust can affect smoke detector operation. Locations like kitchens or dusty areas may require specialized detectors.

Ventilation or airflow (IV): Airflow patterns created by HVAC systems, vents, or fans can direct smoke away from detectors, delaying activation. Proper placement ensures smoke reaches the detector efficiently.

NFPA 72, Chapter 17: Detector spacing, location, and environmental considerations.

by Terrilyn at May 03, 2025, 08:28 PM

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1 months ago

Definitely I, III, and IV. Ceiling height and airflow are crucial factors for proper smoke detector placement.

upvoted 0 times

Annice

8 days ago

I agree, those factors can greatly affect the effectiveness of the detectors.

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Tawna

9 days ago

Yes, all four conditions - ceiling height, detector sensitivity, ambient environment, and ventilation - are important for determining the spacing and location of smoke detectors.

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