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must be 0.75 in (19.00 mm).
When connecting vent pipes use only a small amount of
silicone grease supplied with the exhaust pipes. Do not use
other types of grease.
6.5 Two Pipe Polypropylene System
Two pipe venting allows for exhaust flue and intake flue to be
separated from each other. Fresh air may be drawn in at a
different area from where the flue terminal is located.
Splitting kit consists of adaptor and of intake air vent adaptor.
See Figure 6-8.
Use screws and seals removed from the cap for the air duct
adaptor.
90° elbow allows boiler to connect to the venting termination
regardless of direction since it can be rotated 360°. It can also
be used to connect the vent with 45° elbow.
Elbow
45°
90°
Note
Ensure minimum downward slope of 2 in (50 mm)
for every 4 ft (1 m) of duct length toward boiler.
If using indoor air for combustion do not exceed
Note
100ft (30m) exhaust vent pipe.
FIGURE 6-10 - Separated Flue Termination
(Natalini Venting Only)
6 - COMBUSTION AIR AND VENT PIPING
Total Length Reduction
10" (0.3 m)
2 ft (0.6 m)
FIGURE 6-8 - Two Pipe Polypropylene System
Adapter
Front View
FIGURE 6-9 - Separated Horizontal Flue Termination
I
L max = 32' (10 m)
L
L max = 32' ( 10 m)
M
L max = 29' (9 m)
25
Left side View
Boiler
P/N 240011662, Rev. D [06/30/2017]
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Troubleshooting
