| 摘要 |
<p>Horizontal double-walled flue for a forced-draught heating appliance, intended for passing through a wall. The double-walled flue comprises an essentially horizontal flue pipe (2) situated inside a suction pipe (1) for combustion air, the outflow aperture of the flue pipe viewed in the direction of flow being some distance past the inlet of the suction pipe. The suction pipe has at its free end an essential vertical end wall (8) through which the flue pipe (2) is passed with a suitable seal, and a number of apertures (16) forming the inlet of the suction pipe are provided int he bottom half of the cylindrical wall of the suction pipe near the said end wall.</p> |
