Brandson Equipment 304973 Manual Del Usuario página 23

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We recommend complete coverage and use of additional smoke detectors.
5. Positioning smoke detectors in mobile homes and campers
Campers and caravans, which were built after about 1978, were designed and
insulated to be energy efficient. Smoke detectors should be installed as described
above in campers and caravans which were built after 1978. Older campers and
caravans may have little or no insulation compared to today's standards. Outer
walls and ceilings often consist of non-insulated metal that can transfer the heat
energy from the outside.
This makes the air right next to you hotter or colder than the rest of the indoor
air. These layers of hotter or colder air can prevent smoke from reaching a smoke
detector. Therefore, install smoke detectors in such units only on the inside walls.
Position them at a distance of 10 to 15 cm from the ceiling.
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