Rinnai Common Vent Spec Sheet Specification Sheet
Rinnai Corporation • 103 International Drive • Peachtree City, GA 30269 • Toll-Free: 1-800-621-9419 • Fax: 678-829-1666 • www.rinnai.us
1
SP-CV-02 (2/13)
COMMON VENT SYSTEM
Features and Benefits
The Common Venting System provides for longer vent lengths and fewer wall or roof penetrations than
conventional single-unit venting. CVent provides the necessary components for both combustion air and exhaust
and is made by Ubbink, the same supplier for Rinnai's innovative line of concentric venting. CVent utilizes a CSA-
certified and tested polypropylene venting material. The various sections are self locking and sealing and can be
pushed together without use of cement or glue. CVent can only be used with Rinnai’s RU98 condensing water
heaters.
For combustion air venting, Rinnai’s Common Venting System utilizes both CVent components and, if necessary for
extended vent runs, schedule 40 PVC.
The CVent Common Venting System can be used with up to 8 water heaters with a 41 foot equivalent vent length,
however if used with 7 or fewer units, the maximum equivalent vent length extends to 100 feet.
Advanced features include a precision-made check valve to prevent exhaust gases from penetrating non-operating
water heaters, avoiding negative impacts on combustion and reliability, as well as joint sockets designed to prevent
condensate from gathering in gaps and degrading gaskets.
The current version of CVent is made of polypropylene (PPtl) and is only for U.S. installations.
Model Applicability
The common vent system is CSA certified (ANSI Z21.10.3, Gas Water Heaters Standards) for use only with the
Rinnai tankless condensing water heater RU98i (REU-KB3237FFUD-US).
#790008 CVent Back-2-Back Kit
(Combustion Air & Exhaust)
#790006 Cvent Starter Kit (Back-
2Back or InLine)
#790007 CVent InLine Kit
(Combustion Air & Exhaust)
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