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Maximum Equivalent Vent Length Tables (conti ued):
Total Equivalent Vent Length (Intake/outlet) for Twin Pipe 3" PVC/CPVC
Maximum Vent Length
Terminati n Type
Terminati n 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
Terminati n Type
Terminati n 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 specifi to the fuel type of the tankless water heater. It is imperati e when
performing equivalent vent length calcula ons that the gas type be taken into considerati n.
0
1
2
3
4
5
6
0
1
2
3
4
5
6
Propane Units
41 Feet
IPEX or Royal
Snorkel
Concentric Vent
Terminati n
Kit
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
Terminati n
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
KBP Series Manual
Side Wall Tee
Terminati n
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
Terminati n
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) **
IPEX or Royal
Low Profi e
Terminati n
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 Profi e
Terminati n
5 (1.5)
60 (18.3) **
55 (16.8) **
50 (15.2) **
45 (13.7) **
40 (12.2) **
35 (10.7) **
30 (9.1) **
25
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