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Three types of venting options are available:
1
Direct Vent
Concentric Pipe
Combustion air and exhaust vent directly
through a single concentric connection. Hot
exhaust exits through the interior tube, while
combustion air enters through the outer layer.
Figure 9
Combustion
air
Non-Direct Vent
2
Room air is used for combustion while exhaust
vents to the outside.
Common Vent
3
Direct Vent
Multiple water heaters sharing a combustion air
header and a separate exhaust header that vents
directly through separate penetrations to the
outside.
Figure 12
Demand Duo
H-Series with SENSEI CX Installation Instructions
(Concentric Pipe and Twin Pipe)
Exhaust
Combustion
air
(Room Air)
(Indoor Units Only. Direct Vent and Non-Direct/Room Air Vent)
Exhaust
Combustion Air
Twin Pipe
Combustion air and exhaust vent directly
through separate penetrations.
Figure 10
Exhaust
Combustion
air
Figure 11
Combustion
Non-Direct (Room Air) Vent
Multiple water heaters using room air for
combustion while sharing an exhaust
header that vents directly to the outside.
Figure 13
Exhaust
air
Exhaust
Room Air
For Combustion
19
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