Which mounting option is explicitly allowed by NFPA 72 for smoke detectors?

Which mounting option is explicitly allowed by NFPA 72 for smoke detectors?

• A. Recessed mounting
• B. Surface mounting
• C. Pendant mounting
• D. Ceiling grid mounting

Answer: (A)

NFPA 72 lays out how smoke detectors should be installed so they sample air effectively, stay accessible, and fit with different ceiling types. Recessed mounting is explicitly allowed, meaning the detector can be placed inside a ceiling opening with a recessed base so the device sits flush with the ceiling surface. This lets detectors be integrated into architectural or suspended ceilings without protruding, while still meeting the code’s requirements for installation, accessibility, and air sampling. The other mounting styles listed aren’t described by NFPA 72 as explicit options for standard smoke detectors, or aren’t the typical method endorsed in the code for these devices, which is why recessed mounting is the correct choice.

NFPA 72 lays out how smoke detectors should be installed so they sample air effectively, stay accessible, and fit with different ceiling types. Recessed mounting is explicitly allowed, meaning the detector can be placed inside a ceiling opening with a recessed base so the device sits flush with the ceiling surface. This lets detectors be integrated into architectural or suspended ceilings without protruding, while still meeting the code’s requirements for installation, accessibility, and air sampling. The other mounting styles listed aren’t described by NFPA 72 as explicit options for standard smoke detectors, or aren’t the typical method endorsed in the code for these devices, which is why recessed mounting is the correct choice.