Rinnai CU199i - Page 27

Rinnai Tankless Water Heater Installaon and Operaon Manual 27
All terminaons (horizontal and/or vercal) must terminate 12 in. (0.30 m) above grade or ancipated snow level.
12 in. (0.30 m)
Between terminals at same level
60 in. (1.52 m)
Between terminals at dierent levels
Note: 24 in. (0.61 m)
to wall or parapet
Combuson air and exhaust vent directly through a single
concentric connecon. Hot exhaust exits through the interior
tube, while combuson air enters through the outer layer.
Combuson
air
Exhaust
Concentric Pipe Terminaon Clearances
Direct Vent (Concentric Pipe)
1
Concentric Pipe Overview
Combuson
air
Inside
Corner
12 in.
(0.30 m)
12 in.
(0.30 m)
60 in. (1.52 m) vercal-
ly between terminals