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VII. Venting (continued)
I. Multiple Appliance Terminations
1. Vent Piping Terminations
a. Multiple appliance vent terminations are shown
in Figure 12.
b. Each individual appliance must have its own vent
pipe and vent terminal. Refer to Paragraphs A
through F (as applicable) for individual appliance
vent guidelines and options.
c. For horizontal sidewall terminations, maintain
at least 12 in. (300 mm) minimum horizontal
distance between any adjacent individual
vent terminations. Additional horizontal
spacing between any adjacent individual vent
terminations as well as extending the distance
from building surfaces to vent termination end
are recommended to avoid frost damage to
building surfaces where vent terminations are
placed.
d. Individual appliance sidewall vent terminals
must be placed at least 12 in. (300 mm) [18 in.
(460 mm) in Canada] above the ground plus the
expected snow accumulation.
e. Multiple individual vertical vent pipes may be
piped through a common conduit or chase so
that one roof penetration may be made.
24 in. (610mm) MIN.
Vertical Roof
24 in. (610mm) MIN.
Figure 12: Multiple Appliance Direct Vent Termination
f.
For vertical roof terminations, maintain at least
12 in. (300 mm) minimum horizontal distance
between adjacent individual appliance vent
terminations.
2. Combustion Air Piping
a. Multiple appliance combustion air terminations
are shown in Figure 12.
b. Each individual appliance must have its own
combustion air pipe and terminal when using
category IV venting.
c. Do not exceed the maximum combustion air
pipe length for an individual appliance as listed
in Table 6.
d. If possible, locate the vent and combustion air
terminals for each appliance on the same wall
to prevent nuisance shutdowns. If not, each
appliance may be installed with a roof vent
terminal and sidewall combustion air terminal.
VENT TERMINAL
24 in. (610mm) MIN.
24in. (610mm) MAX.
TO WALL (TYP)
Horizontal Sidewall
34
24 in. (610mm) MIN.
24 in. (610mm) MIN.
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