Rinnai RUR98i Installation And Operation Manual page 31

Certified PVC/CPVC Vent Termination Options (continued)
Twin Pipe (PVC/CPVC) Terminations
PVC/CPVC Sidewall (Tee and Snorkel) Terminations:
Locate the vent and intake air termination using the
following guidelines:
1. The total length of the vent or intake air piping must
not exceed the limits given in maximum equivalent
vent length tables. The equivalent length for 90°
elbows and termination associated with the respective
vent and intake air piping arrangement MUST be
subtracted from total length listed in maximum
equivalent vent tables.
2. Specific to Side Wall Tee Termination, the vent and
intake air piping must terminate at the outside surface
of the outer wall, minimum 1" between wall, tee, and
elbow socket ends.
3. Termination must be installed at least 12" (30.5 cm),
above grade or anticipated snow level.
4. Refer to "Vent Termination Clearances" table for
recommended exhaust/combustion terminal position.
NOTE
If the vent is terminated on a sidewall that is subject to high
winds it is recommended to terminate the vent using a tee.
A tee provides the best protection against wind.
5. The intake air pipe must terminate away from the vent
termination. Both vent and air intake pipe terminations
must be installed 12" (30.5 cm) minimum above grade
or highest anticipated snow level and as shown in
figures to the right.
NOTICE
The information and figures depicting method of
terminating the vent and combustion air intake pipes are
directly related to PVC/CPVC vent systems. When utilizing a
method other than a PVC/CPVC vent system there may be
some variations. Consult the respective vent manufacturer
or the water heater manual for recommendations and
clarifications.
NOTICE
Slope horizontal exhaust piping downward toward the
water heater a minimum of 1/4 inch per foot. DO NOT slope
combustion air piping down towards water heater. Dispose
of condensate per local codes.
12"
Exhaust Vent
Combustion Air
12" min
12" above
grade or
anticipated
snow level
Sidewall Vent and Combustion Air Piping with
12" min
12" above
grade or
anticipated
snow level
Sidewall Vent and Combustion Air Piping with
KBP Series Manual
Exhaust Vent
1" min.
between
wall &
socket end
Tee Termination
Exhaust Vent
Wall
Combustion Air
Snorkel Termination
12" min
Combustion Air
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