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D. EXHAUST VENT/AIR INTAKE PIPE SIZING
1. Table 3.2 shows the Exhaust Vent/Air Intake Size for
P
F
®
PFC-460 boilers.
URE
IRE
Table 3.2: Exhaust Vent/Air Intake Sizing
Boiler Model
PFC-460
2. Polypropylene vent systems can be installed using
®
optional InnoFlue
3.3 shows the appropriate PB Heat stock codes.
Table 3.3: Polypropylene Vent Adapter Stock Codes
Boiler
Centrotherm
Model
InnoFlue
PFC-460
54633
* Use Duravent adapter connector, Part# PPS-PAC, with PB Heat stock
codes 54630 and 54631.
Contact your PB Heat, LLC Representative for more
information on this option.
3. Combined systems using separate polypropylene
exhaust & air inlet pipes which transitions to concentric
can also be installed. Contact your Centrotherm or
DuraVent representative for more information.
4. The total combined length of exhaust vent and air
intake piping is 200 equivalent feet (60 m).
a. The equivalent length of elbows, tees and other
fittings are listed in Table 3.4.
Table 3.4: Equivalent Length of Fittings
Fitting Description
Elbow, 90° Short Radius
Elbow, 90° Long Radius
Elbow, 45° Short Radius
Coupling
Air Intake Tee
Stainless Steel Vent Kit
Concentric Vent Kit
b. The equivalent length can be calculated as follows.
Table 3.5: Sample Equivalent Length Calculation
Exhaust
Straight Length of Pipe
90° Elbows, SR
2 x 5'= 10'
45° Elbows, SR
Conc. Vent Termination
NOTICE
Exhaust Vent/Air Intake length in excess of 200
equivalent feet may result in reduced input due to
excessive pressure drop.
This is well below the 200 feet maximum
equivalent length. If the total is above 200
equivalent feet, alternate boiler locations or
exhaust penetration location should be considered.
Exhaust Vent/Air Intake Size
4" (100 mm)
®
or PolyPro
vent adapters. Table
DuraVent
®
PolyPro
®
54631*
Equivalent Length
5 feet
4 feet
3 feet
0 feet
0 feet
1 foot
3 feet
Air Inlet
Total
50'
50'
100'
1 x 5' = 5'
15'
2 x 3' = 6'
6'
1 x 3' = 3'
3'
Total
124'
VENTING & AIR INLET PIPING
E. EXHAUST VENT/AIR INTAKE INSTALLATION
WARNING
Covering non-metallic exhaust venting material is
prohibited and may result in severe personal injury,
death, or major property damage.
1. Figures 12.1 & 12.2 show the exhaust connection on
top of the boiler, near the rear in the center.
a. The exhaust and air intake connections for PFC-460
boilers are 4" Male CPVC Pipe.
b. These connections are to be joined with suitable
PVC/CPVC adhesives in accordance with
manufacturers' instructions.
2. The Air Intake connection is to the right of the exhaust.
3. Both connections are clearly marked.
WARNING
This appliance uses a positive pressure venting
system. All joints must be sealed completely to
prevent leakage of flue products into living spaces.
Failure to do this may result in severe personal injury,
death or major property damage.
4. Remove all burrs and debris from the joints and fittings.
5. Horizontal lengths of exhaust vent must be installed with
a slope of not less than 1/4" per foot (21 mm per meter)
toward the boiler to allow condensate to drain from the
vent pipe. If the vent pipe must be piped around an
obstacle that causes a low point in the piping, a drain
with an appropriate trap must be installed.
6. All piping must be fully supported. Use pipe hangers
at a minimum of 4 foot (1.22 meter) intervals to
prevent sagging of the pipe.
7. Exhaust and air inlet piping is to be supported
separately and should not apply force to the boiler.
8. Penetration openings around the vent pipe and air
intake piping are to be fully sealed to prevent exhaust
gases from entering building structures.
9. PVC & CPVC Piping:
a. Use only solid PVC or CPVC Schedule 40 or 80
pipe for exhaust venting. Cellular core PVC or
CPVC is not approved for exhaust vent.
b. All joints in vent pipe, fittings, attachment to the
boiler stub, and all vent termination joints must be
properly cleaned, primed and cemented. Use only
cement and primer approved for use with PVC or
CPVC pipe that conforms to ANSI/ASTM D2564.
c. A straight coupling is provided with the boiler to
be used as an outside vent termination. One of
the two screens is to be installed to prevent birds
or rodents from entering.
d. An air intake tee is provided with the boiler to be
used as an outside air intake termination. A screen
is to be installed to prevent birds or rodents from
entering.
13
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