54
8 - INSTALLATION - Vent & combustion air
Figure 42 - Alternate
concentric vertical venting (Example n°2)
Figure 43 - Alternate
concentric vertical venting (Example n°1)
Approved venting materials must be used as
specifi ed in Tables 4 and 5.
Follow all vent / air termination and clearance
requirements per this section to the appropriate
example. Installation must comply with local
requirements and with the National Fuel Gas
Code. The maximum allowable equivalent vent and
air intake lengths for this venting arrangement are
to be determined from Section 8.3.
If an existing unused venting system is converted
for use with this method of concentric venting,
the installer must ensure that the existing
venting system is clean and free from particulate
contamination that will harm this appliance and
cause increased nuisance calls or maintenance.
See Section 8.4 for a list of corrosive contaminants
and sources. Two example scenarios of a
concentric venting arrangement are shown for
illustrative purposes in Figures 42 and 43.
8.13.5 - Alternate vertical
concentric venting
This appliance may be installed with a concentric
vent arrangement where the vent pipe is routed
through an existing unused venting system; or by
using the existing unused venting system as a
chase for vent and combustion air routing.
Concentric Venting Arrangement
The venting is to be vertical through the roof. The
annular space between the O.D. of the vent pipe
and the I.D. of the existing unused venting system
is utilized for the combustion air source. The
minimum size of the existing vent system required
to achieve enough annular space for combustion
air is 7 inches.
The upper and lower termination as well as any
other unsealed joints in the existing vent system
must be sealed to ensure that all combustion air
is drawn from under the vent cap as shown in
Figures 42 and 43.
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