Crown Boiler Phantom X series, Installation And Operating Instructions Manual, Page: 37 / 136

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f. Multiple individual boiler vertical vent pipes
may be piped through a common conduit or
chase so that one roof penetration may be made.
g. For vertical roof terminations, maintain at
least 12 in. (300 mm) minimum horizontal
distance between adjacent individual boiler vent
terminations.
2. Combustion Air Piping
a. Multiple boiler combustion air terminations are
shown in Figure 23.
IV. Venting
G. Multiple Boiler Installation Venting (continued)
b. Each individual boiler must have own
combustion air pipe and terminal. Refer to
Paragraphs A through F (as applicable) for
individual boiler combustion air guidelines and
options.
c. Do not exceed the individual boiler maximum
combustion air pipe length listed in Table 8.
d. If possible, locate vent and combustion air
terminals for an individual boiler on the same
wall to prevent nuisance shutdowns. If not,
an individual boiler may be installed with a
roof vent terminal and sidewall combustion air
terminal.