Rinnai CU199i - Page 29

Rinnai Tankless Water Heater Installaon and Operaon Manual 29
Twin Pipe Terminaon Clearances
Direct Vent (Twin Pipe)
1
Combuson air and exhaust vent directly through separate
penetraons.
Twin Pipe Overview
Exhaust
Combuson
air
For illustraon purposes only. Listed equivalent length is based on worst case scenario of
3 X 90° elbows or 18 equivalent .
Twin Pipe Vercal Terminaon
of Mulple Water Heaters
Combuson air terminaon not permied in shaded area
Horizontal Vent and Combuson Air Piping
12 in. (0.30 m) above
grade or ancipated
snow level
12 in. (0.30 m) minimum
12 in. (0.30 m)
minimum above
combuson air
opening
Roof
12 in. (0.30 m) above
grade or ancipated
snow level
12 in. (0.30 m)
minimum
Exhaust
Combuson
Air
Exhaust
Zone
60 in. (1.5 m)
minimum
12 in. (0.30 m)
minimum
Wall
Combuson
Air
Exhaust