8
VENTING & AIR INLET PIPING
A. GENERAL
1. Install the PUREFIRE
®
boiler venting system in accordance
with these instructions and with the National Fuel Gas
Code, ANSI Z223.1/NFPA 54, CAN/CGA B149, and/or
applicable provisions of local building codes.
2. The P
UREFIRE
®
boiler is approved for positive pressure
exhaust venting using either indoor air or air piped
from outside. It is ETL Listed as a Category IV
(Positive Pressure, Condensing Exhaust Vent)
Appliance.
B. APPROVED MATERIALS
1. Table 3.1 lists approved materials for vent pipe (and
adhesives where applicable). Use only these materials
for exhaust vent piping.
2. PVC Pipe and fittings are not to be used for exhaust
venting in confined spaces such as closet or alcove
installations or vent pipe that passes through attics.
3. Table 3.2 lists appropriate materials for air inlet piping.
Air inlet piping is to be sealed suitably to prevent
introduction of dirt, chemicals or other contaminants
to the inlet air stream.
* PVC pipe/fittings are not to be used for venting within
confined spaces.
Notice: Installations in Canada require compliance with
ULC S636 - Standard for Type BH Gas Venting Systems.
C. EXHAUST VENT/AIR INTAKE PIPE
LOCATION
1. Install vent piping before installing water, fuel, or
condensate piping. Working from largest to smallest
diameter reduces the complexity of piping
interferences.
2. Vent and air intake piping is to be installed so that
there is sufficient access for routine inspection as
required in Section 11, of this manual.
3. The vent piping for this boiler is approved for zero
clearance to combustible construction. However, a fire
stop must be used where the vent pipe penetrates
walls or ceilings.
4. The Peerless
®
PUREFIRE
®
boiler, like all high efficiency,
gas-fired appliances, is likely to produce a vapor
plume due to condensation. Surfaces near the vent
termination will likely become coated with
condensation.
5. The maximum combined vent and air inlet vent
length for the Peerless
®
PUREFIRE
®
boiler is about 200
equivalent feet (60 m).Be sure that the boiler is
located such that the maximum vent length is not
exceeded.
3. VENTING & AIR INLET PIPING
The venting system for this product is to be installed in
strict accordance with these venting instructions.
Failure to install the vent system properly may result in
severe personal injury, death or major property damage.
WARNING
This vent system operates under positive pressure.
Vent connectors serving appliances vented by
natural draft shall not be connected into any portion
of this venting system. Failure to comply may result
in serious injury, death or major property damage.
WARNING
Only the materials listed below are approved for use
with the
P
URE
F
IRE
®
boiler. Use only these components
in accordance with these instructions. Failure to use
the correct material may result in serious injury,
death, or major property damage.
WARNING
Table 3.1: Approved Materials for Exhaust Vent Pipe
Use of cellular core pipe for any exhaust vent
component is prohibited. Use of cellular core pipe
may result in severe personal injury, death, or major
property damage.
WARNING
If the maximum equivalent vent length is exceeded,
the maximum burner input rate may be reduced.
NOTICE
Description Material
Conforming to
Standard
Vent Piping
& Fittings
PVC (Sch 40 or 80)*
ANSI/ASTM D1785
CPVC (Sch 40 or 80) ANSI/ASTM D1785
PVC-DWV*
ANSI/ASTM D2665
FasNSeal
®
UL-1738 & ULC-S636
MUGRO
®
ULC-S636
Pipe Cement
(PVC & CPVC Only)
PVC/CPVC Cement ANSI/ASTM D2564
Table 3.2: Approved Materials for Air Inlet Piping
Description Material
Air Inlet Pipe
& Fittings
PVC (Cellular Core or Solid)
CPVC
ABS
Smoke Pipe (Galvanized or Steel)
Dryer Vent Pipe
Flexible Duct
Stainless Steel
Polypropylene
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