Rinnai CU199i - Page 31

Rinnai Tankless Water Heater Installaon and Operaon Manual 31
2 in. or 3 in.
PVC/CPVC
IPEX / Royal
Concentric
Side Wall
Terminaon
Conguraon
2 in. or 3 in.
PVC/CPVC
IPEX /Royal
Concentric
Vercal
Terminaon
Conguraon
2 in. or 3 in.
Schedule 40
PVC/CPVC
Snorkel
Terminaon
Conguraon
2 in. or 3 in.
Schedule 40
PVC/CPVC
Standard
upside down
"U" Vercal
Terminaon
Conguraon
2 in. or 3 in.
Schedule 40
PVC/CPVC
Elbow or Tee
Side Wall
Terminaon
Conguraon
2 in. or 3 in.
Schedule 40
PVC/CPVC Tee
Vercal
Terminaon
Conguraon
2 in. or 3 in.
PVC Low
Prole
Terminaon
Conguraon
This conguraon requires the use of
a Concentric Vent Terminaon
Exhaust and
combuson air
MUST NOT be
brought
together into
a single PVC
pipe using a
pipe ng.
Twin Pipe Maximum Equivalent Length Table
Vent Sizes 2 in. (51 mm) 3 in. (76 mm)
Vent Lengths 65  (20 m) 150  (46 m)
• 45° elbow is equivalent to 3  (1 m)
• 90° elbow is equivalent to 6  (1.83 m)
WARNING
Twin Pipe Example Vent Applicaons
Twin Pipe Maximum Vent Length
Direct Vent (Twin Pipe)
1
Slope horizontal exhaust 1/4 in. per foot towards the water heater. DO NOT slope combuson air pipe towards
the water heater.
Exhaust
Combuson
Air
Single
Pipe
This conguraon requires the use of
a Concentric Vent Terminaon