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FIGURE 7.18: DURAVENT POLYPRO VERTICAL VENTING WITH CONCENTRIC TERMINAL,
(VENT OPTIONS #12 & 13, TERMINAL OPTION K)
FIGURE 7.17: DURAVENT POLYPRO, SELKIRK POLYFLUE OR CENTROTHERM INNOFLUE VERTICAL SINGLE
WALL PP VENTING, (VENT OPTIONS #12-17, TERMINAL OPTION A)
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