According to NFPA guidance, testing heat detectors is commonly done with which method?

According to NFPA guidance, testing heat detectors is commonly done with which method?

• A. Water spray
• B. Hair dryer
• C. Magnet test
• D. Temperature rise test

Answer: (B)

Testing heat detectors relies on triggering them with a rise in ambient temperature, since they respond to heat either at a fixed threshold or by a rapid rise. A hair dryer is commonly recommended because it provides a safe, controllable source of warm air that gently raises the air temperature around the detector without moisture or direct flame. This lets you observe the detector’s response in a realistic, non-destructive way. Water spray would wet the device and could cause damage or false alarms; a magnet test doesn’t affect the heat-sensing element; and a direct temperature rise test with other methods can be risky or damaging. Using a hair dryer gives a practical, NFPA-aligned way to verify heat detector response.

Testing heat detectors relies on triggering them with a rise in ambient temperature, since they respond to heat either at a fixed threshold or by a rapid rise. A hair dryer is commonly recommended because it provides a safe, controllable source of warm air that gently raises the air temperature around the detector without moisture or direct flame. This lets you observe the detector’s response in a realistic, non-destructive way. Water spray would wet the device and could cause damage or false alarms; a magnet test doesn’t affect the heat-sensing element; and a direct temperature rise test with other methods can be risky or damaging. Using a hair dryer gives a practical, NFPA-aligned way to verify heat detector response.