Rinnai RUC80i Installation And Operation Manual page 24

Maximum Equivalent Vent Length Tables (continued):
Total Equivalent Vent Length (Intake/outlet) for Twin Pipe 3" PVC/CPVC
Maximum Vent Length
Termination Type
Termination Equivalent Length in feet
(meters) (Already factored into the straight
pipe lengths below)
# of 90° Elbows (each: 5 equivalent feet)
Total Equivalent Vent Length (Intake/outlet) for Twin Pipe 4" PVC/CPVC
Maximum Vent Length
Termination Type
Termination Equivalent Length in feet (meters)
(Already factored into the straight pipe lengths
below)
# of 90° Elbows (each: 5 equivalent feet)
**SW 1 in DIPSW 1 is "OFF" for lengths greater than or equal to 21 feet
Maximum vent lengths are specific to the fuel type of the tankless water heater. It is imperative when
performing equivalent vent length calculations that the gas type be taken into consideration.
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Propane Units
41 Feet
IPEX Concentric Snorkel
Vent Kit Termination
20 (6.1) 15 (3.0)
Max. straight pipe vent length in feet (meters)
21 (6.4) ** 26 (7.9) **
16 (4.9) ** 21 (6.4) **
11 (3.4) ** 16 (4.9) **
6 (1.8) ** 11 (3.4) **
- 6 (1.8) **
- 1 (0.4) **
-
Propane Units
IPEX Concentric
Vent Kit Termination
20 (6.1)
Max. straight pipe vent length in feet (meters)
45 (13.7) ** 50 (15.2) **
40 (12.2) ** 45 (13.7) **
35 (10.7) ** 40 (12.2) **
30 (9.1) ** 35 (10.7) **
25 (7.6) ** 30 (9.1) **
20 (6.1) ** 25 (7.6) **
15 (4.6) ** 20 (6.1) **
ATTENTION
KBD Series Manual
Side Wall Tee
Termination
5 (1.5)
36 (11.0) **
31 (9.4) **
26 (7.9) **
21 (6.4) **
16 (4.9) **
11 (3.4) **
- 6 (1.8) **
65 Feet
Snorkel Side Wall Tee
Termination
15 (3.0) 5 (1.5)
60 (18.3) **
55 (16.8) **
50 (15.2) **
45 (13.7) **
40 (12.2) **
35 (10.7) **
30 (9.1) **
Low Profile
Termination
5 (1.5)
36 (11.0) **
31 (9.4) **
26 (7.9) **
21 (6.4) **
16 (4.9) **
11 (3.4) **
6 (1.8) **
Low Profile
Termination
5 (1.5)
60 (18.3) **
55 (16.8) **
50 (15.2) **
45 (13.7) **
40 (12.2) **
35 (10.7) **
30 (9.1) **