Rinnai Sensei N-Series Service Presentation page 109

Maximum Vent Length Quick Reference
Vent Diameter / Vent Type / # of Units
PVC / CPVC / PP DIRECT COMMON VENT / NON - DIRECT COMMON VENT (Room Air), COMMERCIAL
3" Vent (Dual Pipe - Direct Vent / Single Pipe - Room Air) 2 Units
4" Vent (Dual Pipe - Direct Vent / Single Pipe - Room Air) 2 Units
4" Vent (Dual Pipe - Direct Vent / Single Pipe - Room Air) 3 Units
4" Vent (Dual Pipe - Direct Vent / Single Pipe - Room Air) 4 Units
6" Vent (Dual Pipe - Direct Vent / Single Pipe - Room Air) 2 Units
6" Vent (Dual Pipe - Direct Vent / Single Pipe - Room Air) 3 Units
6" Vent (Dual Pipe - Direct Vent / Single Pipe - Room Air) 4 Units
6" Vent (Dual Pipe - Direct Vent / Single Pipe - Room Air) 5 Units
6" Vent (Dual Pipe - Direct Vent / Single Pipe - Room Air) 6 Units
6" Vent (Dual Pipe - Direct Vent / Single Pipe - Room Air) 7 Units
6" Vent (Dual Pipe - Direct Vent / Single Pipe - Room Air) 8 Units
NOTE:
When calculating vent lengths the termination configuration has a length equivalency that must be added to the length of straight pipe, plus all elbow equivalencies (listed
below). For two-pipe vent installations, use the calculated length of the intake or exhaust, whichever is longer. Do not add them together. See installation manual for specifics.
NOTE:
This document is meant as a guide, not as a replacement for the water heater's and/or common vent installation manuals. Refer to those manuals for appropriate lengths.
complete details.
© 2015 Rinnai America Corporation
PROPRIETARY and CONFIDENTIAL
Equivalent lengths – 3", 4", 6" PVC/CPVC/PP Common vent
90⁰ Elbow = 10 feet
Enhancing Lives By Changing The Way Water Is Heated
CU160i
Maximum Equivalent Length in Feet
3" Header
90
4" Header 6" Header
150
100
65
150 150
150 150
150 150
45⁰ Elbow = 5 feet
109
CU199i
3" Header
65
4" Header 6" Header
150
150
65
150 150
150 150
150 150
150 150
150 150
70 150
150
Demand Duo
W/CU199
3" Header
65
4" Header 6" Header
150
150
65
150 150
150 150
150 150
150 150
150 150
70 150
150
11/6/2018