24
6 - COMBUSTION AIR AND VENT PIPING
FIGURE 6-6 - Two Pipe Polypropylene System
Adapter
FIGURE 6-7 - Separated Horizontal Flue Termination
Boiler
Note
If using indoor air for combustion do not exceed
100ft (30m) exhaust vent pipe.
6.9 Twin Pipe Polypropylene and CPVC 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 (GMHB227 ONLY)
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
Elbow
Total Length Reduction
45°
10" (0.3 m)
90°
2 ft (0.6 m)
Twin Pipe Maximum Vent Lengths (See Figure 6-7)
Intake Vent
L1
49 ft (15m)
Exhaust Vent
L2
51 ft (15.5m)
Combined Vent
L1+L2
100 ft (30.5m)
Note
Do not count first elbow against maximum vent
length.
PN 240012369, REV A [08/31/2018]
Содержание GMHB227
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