| 摘要 |
An extraction system for a gas fire includes a flue pipe 30 extending from the fire through an exterior wall of the building in which the fire is located and an extraction fan 34 mounted at the outlet of the flue pipe to provide positive extraction of combustion products. A flow detector 38 in the flue pipe is arranged to close a valve and cut off the supply of gas to the fire in the event that the flow rate through the flue pipe 30 falls below a value adequate for safe extraction of combustion products. The flue pipe may comprise telescopically adjustable stub pipes 42, 46 (Fig 2, not shown) and a silencer 44, which may be removable. <IMAGE> |
