| 摘要 |
An improved firestop fitting (10) which prevents the spread of smoke and fire through a wall (100, 110, 120) between rooms in a building is described. The fitting includes a thermally releasable plug (16) mounted in an extension conduit (14) from a main conduit (12) of the fitting which is activated by a fire to allow the plug to move into and block the main conduit. The fitting is particularly adapted for buildings where plastic pipe is used to carry fluid between rooms.
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