| 摘要 |
A smoke and fire detector apparatus includes a base for mounting the apparatus on a wall and a tubular extension having one end attached to the base and an opposite end adapted to extend through an aperture formed in a ceiling of a room into an attic space. A sensing circuit, an audio alarm device and a power supply are mounted on the base and electrically connected to one another. A smoke sensor is mounted on the opposite end of the tubular extension and is electrically connected to the sensing circuit through the tubular extension. A second smoke sensor can be mounted on the base and electrically connected with the sensing circuit.
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