Twin Pipe Systems - Baxi LUNA DUO-TEC 60 GA Notice D'installation

6.9 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 a 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 Maximum Vent Lengths
1.48 GA /60 GA
Intake Vent L1
Exhaust Vent L2
Combined Vent L1+L2
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.
Maintain 12" (305 mm) US, 18" (457 mm) Canada clearance above highest anticipated snow level, 24" (610 mm) above roof.
Grade, Snow
Avoid locations where snow may drift and block vent and combustion air. Ice or snow may cause boiler to shut down if vent or
& Ice
combustion air becomes obstructed.
3" [80 mm]
100 ft
100 ft
200 ft
FIGURE 6-11 - 3" Twin Pipe Separated Horizontal Flue
Termination
FIGURE 6-12 - 3" Twin Pipe Separated Horizontal Flue
Termination -
FIGURE 6-13 - 3" Twin Pipe Separated Horizontal Flue
Termination With Tee On Exhaust
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240012485 REV A [12/30/2018]