Use and Care Manual

22
Below items are required for connecting.
H
V
Slope the Vents
Upward
2PPS-X3L (DuraVent®)
2PPS-ADL (DuraVent®)
2 in. PVC/CPVC coupler
2 in. PVC/CPVC pipe
• Equivalent vent length calculation example:
[Example 1]
- Vent Size: 3 in.
- V (Vertical length): 25 ft
- H (Horizontal length): 5 ft
- 87° elbow: 2
1 ft × 25 + 1 ft × 5 + 5 ft × 2 = 40 ft
 
Select “Short length”
[Example 2]
- Vent Size: 3 in.
- V (Vertical length): 30 ft
- H (Horizontal length): 10 ft
- 87° elbow: 3
1 ft × 30 + 1 ft × 10 + 5 ft × 3 = 55 ft
 
Select “Long length”
[Centrotherm® - Flex Through Chimney w/ Air
Intake (Only 3 in.)]
The vent length condition setting depends on
the flexible pipe length, the rigid pipe length and
number of elbows. Calculate an each ventilation
system equivalent length, then adjust the DIP
switch.
Vent
length
condition
DIP
switch
#7
Maximum equivalent
vent length*
Equivalent
length
Short
length

Exhaust vent
V (Vertical) + H (Horizontal):
< 50 ft (15 m)
Air Intake:
< 50 ft (15 m)
Flexible pipe:
1 ft (0.3 m)
Rigid pipe:
1 ft (0.3 m)
90° elbow:
5 ft (1.5 m)
45° elbow:
3 ft (0.9 m)
Long
length

Exhaust vent
V (Vertical) + H (Horizontal):
50 ft (15 m)–75 ft (22.5 m)
Air Intake:
50 ft (15 m)–75 ft (22.5 m)
ON =  / OFF = 
* The maximum vent length includes elbows.
Here
Venting the Water Heater