Performance of Home Smoke Alarms - National Institute of ...

SDC02 was a flaming chair test in the manufactured home. Figure 123a shows the number andmass concentrations for this test. Both started rising around 100 s. Figure 123b shows theionization chamber results. The hallway chambers responded within 20 s of ignition, while theremote bedroom chambers responded 70 s after ignition. The difference between the response ofthe remote bedroom chambers and the mass and number concentration is attributed todifferences in aerosol transport time to the instruments.SDC06 was a smoldering mattress test in the manufactured home. Figure 124 shows the numberconcentration and the ionization chamber results. The mass concentration was not recordedduring this test. The number concentration declined until about 6000 s when it shot up after themattress flamed. The initial decrease in number concentration appears to be related to decreasein the ambient number concentration during the long period the house was closed up. Ionizationchambers started to increase slightly around 2800 s then climbed rapidly between 5700 s and5900 s.SDC07 was a flaming mattress test in the manufactured home. Figure 125 shows the numberconcentration and the ionization chamber results. Again, mass concentration was not recordedduring this test. The hallway chambers increased rapidly around 50 s while the remote bedroomchambers increased nearly as rapidly, but delayed until about 130 s. The number concentrationstarted to increase very rapidly at 150 s.SDC08 was a smoldering mattress test in the manufactured home. Figure 126a shows thenumber and mass concentrations for this test. Number concentration was flat and no massconcentration was recorded until about 3750 s, 70 s after the mattress started to flame, when bothincreased rapidly. Figure 126b shows the ionization chamber results. The chambers located inthe hallway and target room started rising as early as 500 s. The hallway ionization chambersincreased rapidly around 3680 s, while the target room chambers did the same around 3730 s.SDC10 was a flaming chair test in the manufactured home. Figure 127a shows the number andmass concentrations for this test. The number concentration started rising about 130 s afterignition with the mass concentration following 10 s later. Figure 127b shows the ionizationchamber results. The hallway chambers started to increase sharply at 55 s, while the remotebedroom chambers started to rise between 110 s and 120 s.126