Results for: obs

How much smoke is needed to set off the alarm?

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… Full Answer