Noritz NRCB180DV - Select a Vent Type

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Increasers are required when using 3 in. flexible pipe.
3 in. Elbow
ISIS0203
(Centrotherm®)
H
V
Slope the Vents
Upward
Slope the Vents
Upward
6.3 Select a Vent Type
Combustion air is
supplied from the
outdoors. Combustion
air and exhaust are
seperate vent pipes.
Combustion
air
Exhaust
Direct Vent
Combustion air is
supplied from the
surrounding indoor air.
Combustion
air
Exhaust
Non-Direct Vent (with SV Conversion Kit)
Exhaust gasses and
combustion air must not
be combined into a single
PVC pipe using a “Y”
fitting.
WARNING
Combustion
air
Exhaust
Single
Pipe
Venting the Combi Boiler