Bryant BFIT 1000, Installation, Operation And Maintenance Manual

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Figure 11: Multiple Boiler Direct Termination
H. Common Venting Requirements
1. Category II Venting
a. Category II venting is an engineered system
and shall be designed by a qualified vent
manufacturer using accepted engineering
practices and “Approved” by the local
authority.
i.
Common venting with other appliances
is prohibited.
ii.
Vertical vent is recommended. Other
horizontal and vertical arrangements
may be acceptable if proven by the vent
manufacturers design calculations.
iii.
To prevent backflow through the boiler,
vent systems shall be designed to
maintain a
negative 0.001 in. w.c. to
negative 0.1 in. w.c.
draft at all times
from the minimum to the maximum
firing rate measured at the outlet of
the boiler.
iv.
A mechanical draft fan may be required
to maintain the required negative draft.
v.
A vent dBFITer may be required as part
of the engineered system.
vi.
It is recommended that a Carbon
Monoxide detector be installed and
interlocked to the boiler. Consult
your local jurisdiction for additional
requirements.
VII. Venting
(continued)
WARNING
Thermal Solutions takes no responsibility for
vent systems that create issues and or affect
the performance of the boiler.
Improper Installation of a Category II vent
system resulting in positive pressure in the
vent system can result in flue gas spillage and
carbon monoxide emissions, causing severe
peronal injury or death.