| 摘要 |
A gas fire space heater which can be an insert for an existing fireplace or a free standing unit is described. The device consists of a gas burner with radiants disposed within a housing. The products of combustion are collected in a first plenum, directed through a concertina heat exchanger into a second plenum, and from the second plenum up a flue. Air to be heated is collected by a blower and circulated countercurrently to the products of combustion through the heat exchanger, around the housing, and into the space to be heated. Air to be heated is supplied to the blower from an outside vent, and an inside vent. The outside vent is controlled by a one-way suction damper and the inside vent is controlled by a manual damper. The two vents form a T at the fan inlet and control of the manual damper then controls the amount outside and inside air supplied to the blower. A thermostatic control is provided in the flue to ensure that the blower is shut off if the flue temperature drops below a predetermined temperature whereby the flue may no longer draw. The preferred blower capacity is 200 cubic feet per minute, and the concertina heat exchanger is about three and one half inches by sixteen inches by sixteen inches. |
