| 摘要 |
One exchanger unit comprises a length of exhaust pipe tube having a plurality of smaller heat exchange tubes which extend diametrically through the exhaust pipe tube. Each of the heat exchange tubes is canted slightly longitudinally of the exhaust pipe tube and the heat exchange tubes are disposed in a helical configuration to force the exhaust gases to swirl through the exhaust pipe tube. The heat exchanger units can be disposed in a furnace exhaust pipe or can be arranged between inlet and outlet plenums which are connected in a furnace exhaust pipe or the like.
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