Twin Pipe Systems - Dunkirk DCBF-125 Installation, Operation & Maintenance Manual

WARNING
!
Asphyxiation hazard! Improper installation could
result in death or serious injury. Read Twin Pipe
Installation Instructions completely and understand all
requirements before beginning installation.

5.8 Twin Pipe Systems

Twin pipe venting allows exhaust flue and intake flue to be
separated from each other. Fresh air is drawn in at a different
area from the flue terminal location.
A.
Twin Pipe CPVC System
CPVC is approved for boiler exhaust. CPVC or PVC are both
approved for air intake.
To transition from Coaxial at the top of the boiler to Twin Pipe
CPVC/PVC, adapter kit is available.
B.
Twin Pipe Polypropylene System
Single wall polypropylene is used for both exhaust and air
intake piping.
To transition from Coaxial at the top of the boiler to Twin Pipe
polypropylene venting an adapter kit is available.
C.
Twin Pipe Separated Flue
Exhaust and combustion air intake are not located in same
general location.
D.
Twin Pipe - Common Atmospheric Zone
Termination
Exhaust and combustion air intake are located in same
general location and are of equal length.
Twin Pipe Vent Lengths
(Includes first elbow and termination)
Boiler Size
Vent Size
Intake Vent L1
Exhaust Vent L2
Combined
L1+L2
Vent
Single Wall Elbows - Equivalent Length
3"
45° bend 0.82 ft [0.25 m]
90° bend 1.64 ft [0.50 m]
NOTE: Two pipe can be installed horizontally or vertically.
5 - COMBUSTION AIR AND VENT PIPING
125/150
3" 2"
[80 mm] [50 mm]
Maximum
49 ft [15m]
85 ft
[25.9 m]
147 ft [45 m]
170 ft
196 ft [60 m]
[51.8 m]
2"
3 ft [0.91 m]
5 ft [1.5 m]
FIGURE 5-8 - 3"/ 80 mm Twin Pipe Separated
Horizontal Flue Termination
FIGURE 5-9 - 3" / 80 mm Twin Pipe Separated
Horizontal Flue Termination -
FIGURE 5-10 - 2" / 50 mm & 3" / 80 mm Twin Pipe
Separated Horizontal Flue Termination With Tee On
Exhaust CAN BE USED ON ALL SIZES
All
Minimum
6 ft
[1.8 m]
12 ft.
[3.6m]
Grade, Snow
& Ice
17
Maintain 12"(305 mm) US, 18"(457 mm)
Canada clearance above highest anticipated
snow level, 24" (610 mm) above roof.
Avoid locations where snow may drift and
block vent and combustion air. Ice or snow
may cause boiler to shut down if vent or
combustion air becomes obstructed.
240012564 REV A, [05/15/2019]
This
Termination
can be used
on
3"/ 80 mm
vent
only
This
Termination
can be used
on
3"/ 80 mm
vent
only
This
Termination
can be used on
2" / 50 mm &
3"/ 80 mm
vent only