Heiman SMOKI HM-626PHS, User Manual

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13.5 Smoke alarms may not be heard.
Though the alarm horn in this unit meets or exceeds current
standards, it may not be heard if: 1) the unit is located
outside a closed or partially closed door, 2) residents
recently consumed alcohol or drugs, 3) the alarm is
drowned out by noise from stereo, TV, traffic, air conditioner
or other appliances, 4) residents are hearing impaired or
sound sleepers. Special purpose units, like those with
visual and audible alarms, should be installed for hearing
impaired residents.
13.6 Smoke alarms may not have time to alarm before the
fire itself causes damage, injury, or death, since smoke
from some fires may not reach the unit immediately.
Examples of this include persons smoking in bed,
children playing with matches, or fires caused by
violent explosions resulting from escaping gas.