82
11 - INSTALLATION - Vent and combustion air
Minimum
clearance
above snow
level (18”
for Canada)
Maximum 24”
above roof or
snow level)
Combustion
air intake
Figure 11-27 Concentric multiple heaters
vertical terminations
11.14.4 - Multiventing
vertical terminations
When two (2) or more direct vent
appliances are vented near each
other, each appliance must be
individually vented (see Figure 11-27).
WARNING!!!
NEVER
common vent or breach
vent this appliance to avoid
possibility of severe personal
injury, death, or substantial
property damage.
When two or more direct vent
appliances are vented near each
other, two vent terminations may be
installed as shown in Figure 11-27. It
is important that vent terminations be
made as shown to avoid recirculation
of fl ue gases.
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