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SECTION J-4
Vertical Direct Venting/Combustion Air (Category I)
Figure J-4
VERTICAL DIRECT VENTING WITHOUT ADD-ON CONDENSING HEAT EXCHANGER
*Vent lengths are based on a lateral length of 2 feet. Refer to the latest edition of National Fuel Gas Code for further details
(ANSI Z223.1) or in Canada the latest edition of CAN/CGA-B149.1 and B149.2.
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