I have a question regarding the drawings of the heating furnace
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Excuse me, on the diagram below, there are many large circles containing several numbers; there’s one in the upper left corner, and perhaps a few in the lower right corner. What do this circle and number mean?
The pipe openings match: the upper left corresponds to the details of the pipe openings, while the lower right corresponds to the sorting by quantity; 14 means it is the 14th one
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