Venting Requirements - Rinnai RH180 Operation And Installation Manual

Venting Requirements

Masonry Vertical Venting
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 obstruction 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 tile lined masonry chimney. The chimney must be lined with
either B-Vent or a listed chimney lining system.
Connection to a chimney must be firmly attached, sealed and must be located above the extreme bottom of the
chimney.
B-Vent Vertical Venting
Vertical gas vent must be installed with U.L. listed type B-vent material in accordance with the manufacturer's
installation instructions and the requirements stated in the "National Fuel Gas Code", NFPA 54, ANSI Z223.1-
latest edition and the requirements of local codes.
Vent should extend in a generally vertical direction. 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 vertical height of the vent.
An unused chimney or masonry enclosure may be used as a chase for the installation of listed B-vent material.
Common Venting
As a Category I appliance, this water heater can be vented vertically with type B-1 vent systems and lined
masonry chimneys. Follow the National Fuel Gas Code, ANSI Z223.1 and or the National Gas Installation code,
CSA-B149.1 & .2 for proper installation practices. If you are unsure or need assistance in correct application of a
common vent installation consult the local gas authority for assistance in the vent system design.
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