Rinnai RH180 Operation And Installation Manual page 19

Ven ng Requirements
Masonry Ver cal Ven ng
Masonry Chimneys shall be built and installed in accordance with NFPA 211, Standard for Chimneys, fireplaces,
Vents and Solid Fuel-Burning Appliances.
Before assembling the vent connector to a chimney, the chimney must be inspected for signs of obstruc on or
damage. If previously used for solid or liquid fuel burning appliances or fireplaces, the chimney must be cleaned.
Do not connect the vent of this water heater to a chimney servicing a separate solid fuel burning appliance.
Do not connect the vent of this water heater to a le lined masonry chimney. The chimney must be lined with
either B-Vent or a listed chimney lining system.
Connec on to a chimney must be firmly a ached, sealed and must be located above the extreme bo om of the
chimney.
B-Vent Ver cal Ven ng
Ver cal gas vent must be installed with U.L. listed type B-vent material in accordance with the manufacturer's
installa on instruc ons and the requirements stated in the "Na onal Fuel Gas Code", NFPA 54, ANSI Z223.1-
latest edi on and the requirements of local codes.
Vent should extend in a generally ver cal direc on. Any vent angle less than 45 degrees is considered horizontal.
The total horizontal distance of the vent system plus the horizontal length of the vent connector must not
exceed 75 percent of the ver cal height of the vent.
An unused chimney or masonry enclosure may be used as a chase for the installa on of listed B-vent material.
Common Ven ng
As a Category I appliance, this water heater can be vented ver cally with type B-1 vent systems and lined
masonry chimneys. Follow the Na onal Fuel Gas Code, ANSI Z223.1 and or the Na onal Gas Installa on code,
CSA-B149.1 & .2 for proper installa on prac ces. If you are unsure or need assistance in correct applica on of a
common vent installa on consult the local gas authority for assistance in the vent system design.
RH180 Manual 19