3. Combined systems using separate polypropylene
exhaust & air inlet pipes which transitions to concentric
can also be installed. Contact you Centrotherm,
Duravent or NovaFlex representative for more
information.
4. All 2" SCH40 PVC applications require the
first 10 equivalent feet to be of CPVC or
Polypropylene material.
a. The equivalent length of elbows, tees and other
fittings are listed in Table 3.3.
E. EXHAUST VENT/AIR INTAKE INSTALLATION
1. Figures 12.1 & 12.2 show the exhaust connection on
top of the boiler, near the rear in the center.
a. The exhaust connection for PBC-34™, PBC-40™,
and PBC-52™ boilers is a 3" polypropylene adapter
that will accept PVC, polypropylene or AL29-4C
stainless steel piping. All materials are secured using
the built in band clamp. Tighten securely. DO NO
USE CEMENT ON BOILER CONNECTIONS.
b. All PVC/CPVC connections after the boiler
connection are to be joined with suitable
PVC/CPVC adhesives in accordance with
manufacturers’ instructions.
13
VENTING & AIR INLET PIPING
Figure 3.12: Venting Through a Chimney Using
Sidewall Outside Air
Figure 3.13: Venting with a Chimney Using Inside Air
Maximum Allowable Vent Length (Ft)
2" (60mm) Diameter
Feet (Meters)
3" (60mm) Diameter
Feet (Meters)
PBC-34
60 (18.28) 100 (30.48)
PBC-40
60 (18.28) 100 (30.48)
PBC-52
20 (6.1) 100 (30.48)
Table 3.2: Maximum Allowable Vent Length for
Series PBC™ Boiler Installations
Equivalent Length (Feet)
Vent Size
2" Vent
3" Vent
Elbow, 90°
7 feet
5 feet
Elbow, 45°
4 feet
3 feet
Coupling
0 feet
0 feet
Air Intake Tee
0 feet
0 feet
Concentric Vent Kit
3 feet
3 feet
Table 3.3: Equivalent Length of Fittings
Exhaust Vent/Air Intake length in excess of maximum
listed equivalent feet may result in reduced input due
to excessive pressure drop.
NOTICE
Covering non-metallic exhaust venting material is
prohibited and may result in severe personal injury,
death, or major property damage.
WARNING
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