John Wood Commercial - 300-400K BTU - Manual (Page 30)

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four concentric terminations
Four concentric terminations may be installed in close proximity
as shown in Figure 38. See Figure 34 and Figure 35 on page 29 for
detailed information on clearances and additional arrangement
options.
SIDEWALL
ROOF
figure 38
eight concentric terminations
Eight concentric terminations may be installed in two stacked
groups of four, in close proximity, as shown in Figure 39. See
Figure 36 on page 29 for detailed information on clearances.
Lateral groups of four as shown in Figure 35 on page 29 may be
a more convenient installation arrangement for multiple groups
depending on available space.
SIDEWALL
ROOF
figure 39
multiple concentric termination arrangements
The illustrations on this page show some of the installation
arrangements for multiple concentric terminations that are
allowed.
See Multiple Concentric Termination Clearances on page 29 for
detailed information on clearances and additional arrangement
options.
note:
When multiple concentric terminations are installed
through a roof in the same location all termination caps must be
at the same height measured from the ground.
two concentric terminations
Two concentric terminations may be installed in close proximity
as shown in Figure 37 or with standard clearances when this
arrangement is not possible. See Figure 32 on page 29 for detailed
information on clearances. See Figure 33 on page 29 when
installing three concentric terminations.
SIDEWALL
ROOF
figure 37