State Industries Power Vent/Power Direct Vent Gas Models - Manual (Page 25)

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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 G.
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 I.
figure h.
Concentric Vent Terminations
for Horizontal Direct Venting.
figure I.
Concentric Vent Terminations for Vertical
Direct Venting through a roof.