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A residential smoke alarm must be at least 75 dBA, or 15 dBA above average ambient sound (whichever is greater), measured at pillow location, meaning that it may be much louder at the source.

In a "high ambient noise area" it must be 110 dBA.

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11y ago
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12y ago

This all depends on the type of smoke alarm you have. here are a few examples:

Ionization 2.6â€"5.0% obs/m (0.8â€"1.5% obs/ft)

Photoelectric 6.5â€"13.0% obs/m (2â€"4% obs/ft)

Beam 3% obs/m (0.9% obs/ft)[citation needed]

Aspirating 0.005â€"20.5% obs/m (0.0015â€"6.25% obs/ft)

Laser 0.06â€"6.41% obs/m (0.02â€"2.0% obs/ft)

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Q: How much smoke is needed to set off the alarm?
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