This arrangement allows the fire door to be released by a signal an open from a detector or fire alarm relay or a broken wire fail safe or by the melting of one of the fusible links. 1 where fusible links are used one fusible link shall be located near the top of the opening and. This standard regulates the installation and maintenance of assemblies and devices used to protect openings in walls floors and ceilings against the spread of fire and smoke within into or out of buildings.
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