Installation instructions
C 950/C 1050 (Pro TL 175 C/199 C) – 6 720 805 440 (2019/10)
18
4.3.2 Vent specifications
Establish vent clearances that comply with the vent
manufacturer's specifications and all applicable national/local
codes.
Venting specifications
[1] ULC S636-95, UL1738 certified
Table 7 Venting specifications for intake and exhaust
Condensate drain requirements
When the Water Heater is installed in a residential single family
dwelling without direct recirculation an external condensate
drain is not required.
If the Water Heater is installed in an application other than a
residential single family dwelling an external condensate drain
(not supplied with the Water Heater) is required in the following
circumstances:
• Vertical terminating exhaust vent installations.
• Horizontal terminating exhaust vent installations greater
than 6 feet (1.8 m) linear measurement, (NOT total
equivalent length).
• Vent installations where any section of the exhaust vent
pipe passes through an unconditioned space.
Note: An external condensate drain is recommended in all
installations as best practice in order to maximize the longevity
of the Water Heater.
Minimum combustion air and exhaust pipe length
The minimum exhaust pipe length is 1 foot (0.3m) of straight
vent pipe. The minimum combustion air pipe length is one 90°
elbow, except with the Common Vent System where the
provided air intake grill cap is used.
Maximum combustion air and exhaust pipe length
The following tables display the maximum allowable straight
pipe lengths for combustion air and exhaust piping with
consideration to the number of elbows used. Reduce the
equivalent length for each elbow used from the maximum
allowable length depending on the system used.
Refer to table 8 if using 2" diameter venting.
Refer to table 9 if using 3" diameter venting.
Refer to table 10 if using 4" diameter venting.
Table 8 Maximum Allowable Exhaust and Combustion Air
Lengths for 2" PVC venting
Table 9 Maximum Allowable Exhaust and Combustion Air
Lengths for 3" PP, PVC, CPVC, and ABS venting
Table 10 Maximum Allowable Exhaust and Combustion Air
Lengths for 4" PP, PVC, CPVC, and ABS venting
Diam. Approved terminals
E
x
h
a
u
s
t
3 or 4 inches “T” terminal
2, 3 or 4
inches
90° elbow
3 inches PVC Flue Cap*(ECAP321)Vertical
terminations 3" diameter only
3 or 4 inches Concentric (196016, 196006)
I
n
t
a
k
e
3 or 4 inches “T” terminal
2, 3 or 4
inches
90° elbow
3 inches PVC Flue Cap*(ECAP321)Vertical &
horizontal terminations approved 3"
diameter only
3 or 4 inches Concentric (196016, 196006)
2" Venting Maximum
allowable
Exhaust
pipe
length
Combustion
air pipe
length
Elbow
Equivalency
90° 45°
Twin pipe
with two
terminations
9.5ft 9.5ft 5 ft
1)
/
2.5 ft
2)
1) If using 90° short sweep elbow.
2) If using 90° long sweep elbow.
2.5 ft
3" Venting Maximum
allowable
Exhaust pipe
length
Combustion
air pipe
length
Elbow
Equivalency
90° 45°
Twin pipe with
two
terminations
31ft 31ft 5 ft 3 ft
Twin pipe with
concentric
termination
23ft 23ft 5 ft 3 ft
4" Venting Maximum
allowable
Exhaust pipe
length
Combustion
air pipe length
Elbow
Equivalency
90° 45°
Twin pipe 63ft 63ft 2.5ft 1.5ft
Concentric 43ft 43ft 2.5ft 1.5ft
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