| 摘要 |
The chimney extension comprises coaxial annular bodies (1) one above the other, while between the topmost one and that below it is a guide body (2) masking the openings (3) in them. This is hollow and in two domed halves (8, 9). The annular bodies are of even circular shape with surfaces (6) domed outwards, and are detachably secured to each other by distance-pieces (4) at intervals round the periphery. ADVANTAGE - Controlled smoke discharge with improved heating efficiency and fuel consumption.
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