| 摘要 |
The cartridge 3 is housed in a sleeve 2 which has a bead 4 projecting around the inside of it's bore enabling the cartridge to be mounted in the sleeve via snapping lugs 24 engaging the bead. The cartridge typically contains closable shutters 8A and 8B operated by a fusible link which gives way at a suitable temperature threshold. The sleeve containing the cartridge is generally sealed in the opening of a wall and connects the respective ends of a ventilation pipe.
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