Allied Air A80DS2V, Installation Instructions Manual

Page: 15 / 63

506892-01 Page 15 of 64 Issue 1251
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8. The common vent diameter must always be at least as
large as the largest vent connector diameter.
19. In no case, shall the vent connector be sized more than
two consecutive table size diameters over the size of
the draft hood outlet or flue collar outlet.
20. Do not install a manual damper, barometric draft
regulator or flue restrictor between the furnace and the
chimney.
21. When connecting this appliance to an existing dedicated
or common venting system, you must inspect the venting
system’s general condition and look for signs of
corrosion. The existing vent pipe size must conform to
these instructions and the provided venting tables. If
the existing venting system does not meet these
requirements, it must be resized.
Table 5
Capacity of Type B Double Wall Vents with Type B Double Wall Connectors
Serving a Single Category I Appliance
NOTE: Single appliance venting configurations with zero lateral lengths are assumed to have no elbows in the vent system. For all other vent
configurations, the vent system is assumed to have two 90 ° elbows. For each additional 90° elbow or equivalent (for example two 45° elbows equal
one 90° elbow) beyond two, the maximum capacity listed in the venting table should be reduced by 10 percent (0.90 x maximum listed capacity).