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Common Vent Maximum Equivalent Vent Lengths
For the table below:
•
Header is the main vent pipe into which several vents connect
•
Vent Length is the distance from the end of the header to the
vent termination.
•
Maximum vent length starts at the end of the header system.
•
Use 10 ft (3 m) as equivalent vent length for 90° elbows.
•
For use with CU199i internal (indoor) tankless water heaters only.
Common Vent Maximum Equivalent Vent Length
Rinnai Common Vent System or Schedule 40 PVC/CPVC
Water Heater
Model
CU199i
(REU-N3237FFC-US)
32
Max System
# Water
Heaters
BTU/HR
2
398,000
3
597,000
4
796,000
5
995,000
6
1,194,000
7
1,393,000
8
1,592,000
3 in.
3 in.
Vent Diameter
Vent Diameter
65 ft
Rinnai Commercial Hybrid System Installation and Operation Manual
Header
Vent Length
HEADER DIAMETER
4 in.
4 in.
6 in.
Vent Diameter
150 ft
65 ft
150 ft
70 ft
6 in.
6 in.
Vent Diameter
150 ft
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