Rinnai SENSEI RSC160i Installation And Operation Manual page 37

1. Direct Vent
Concentric Pipe Overview
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.
Concentric Pipe Termination Clearances
12 in.
(0.30 m)
Inside
Corner
Corner
Figure 22: Concentric Pipe Termination Clearances
All terminations (horizontal and/or vertical) must terminate 12 in. (0.30 m) above grade or anticipated
snow level.
Rinnai Tankless Water Heater Installation and Operation Manual
(Concentric Pipe)
12 in.
(0.30 m)
60 in. (1.52 m) ver�cally
between terminals
Exhaust
Combustion
air
Figure 23: Concentric Pipe
60 in. (1.52 m)
Note: 24 in. (0.61 m)
to wall or parapet
Figure 24: Between terminals at
different levels
12 in. (0.30 m)
Figure 25: Between terminals at same
level
Combustion
air
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