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(11) | EP 0 400 757 A3 |
| (12) | EUROPEAN PATENT APPLICATION |
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| (54) | Gas-fired heating apparatus |
| (57) The apparatus comprises a furnace which is provided on one side, preferably at the
bottom, with one or more burners (6) which can be ignited by a pilot light (22), and
at the top with a heat exchanger (1) covered by a top wall (12) connecting a flue
(14). A self-acting valve (16) is mounted in the flue, which valve is opened when
a fan (30) arranged in the air supply duct or the flue rotates at a high speed, and
closed, for instance by means of a weight (18) or a spring, when said fan rotates
at a low speed. An air passage (31) may be provided in the flue downstream of the
self-acting valve to create a by-pass effect. |