John Wood Envirosense Power Direct Vent (prior to May 2010) - Manual (Page 24)

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8. Operate heater through 1 heat cycle to ensure combustion-air and
vent pipes are properly connected to concentric vent termination
connections.
fIGure 30.
MultI-concentrIc vent terMInatIons
When two or more appliances are directed vented with concentric
vent terminations near each other, each appliance must be
individually vented. NEVER common vent this appliance. When
two or more appliances are direct vented using concentric vent
terminations, the appliances may be vented as shown in Figure H
and Figure 32.
fIGure 31.
Concentric Vent Terminations
for Horizontal Direct Venting.
fIGure 32.
Concentric Vent Terminations for Vertical
Direct Venting through a roof.