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Upright furnaces shall be permitted to be installed in an attic, furred, or under-floor space exceeding 5 feet (1524 mm) in height, provided the required listings and furnace and duct clearances are observed. Horizontal furnaces shall be permitted to be installed in an attic, furred, or under-floor space, provided the required listings and furnace and duct clearances are observed.
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8.10.4.7 Installation Requirements,
not exceeding 2 in 12 (16.7 percent) are considered horizontal in the application of 8.10.4.7, and upright and pendent sprinklers shall be permitted ...