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In addition to PVC and ABS pipe and fittings, Innoflue® by
Centrotherm Eco Systems and PolyPro® by M&G Duravent
are also approved vent and combustion air materials for
installations in the U.S.A. and Canada. Manufacturers
Installation instructions for these products must be followed.
These products have specific instructions for installing,
joining and terminating. Do not mix materials or components
of one manufacturer with materials or components of another
manufacturer.
All furnaces are manufactured with 2” vent / intake pipe and
connectors. For furnaces requiring installation of 3” pipe,
the transition from 2” to 3” should be done as close to the
furnace as practically possible.
This furnace must not be connected to Type B, BW, or L vent
or vent connector, and must not be vented into any portion
of a factory built or masonry chimney except when used as
a pathway for PVC as described later in this section. Never
common vent this appliance with another appliance or use
a vent which is used by a solid fuel appliance. Do not use
commercially available “no hub connectors” other than those
shipped with this product.
It is the responsibility of the installer to follow the
manufacturers’ recommendations and to verify that all vent/
flue piping and connectors are compatible with furnace
flue products. Additionally, it is the responsibility of the
installer to ensure that all piping and connections possess
adequate structural integrity and support to prevent flue pipe
separation, shifting, or sagging during furnace operation.
Dual Certification: Non-Direct/Direct Vent
WARNING
To avoid bodily injury, fire or explosion solvent cements
must be kept away from all ignition sources (i.e., sparks, open
flames, and excessive heat) as they are combustible liquids.
Avoid breathing cement vapors or contact with skin and/or
eyes.
This furnace is dual certified and may be installed as a non-
direct vent (single pipe) or direct vent (dual pipe) appliance.
A non-direct vent installation requires only a vent/flue pipe,
while a direct vent installation requires both a vent/flue pipe
and a combustion air intake pipe. Refer to the appropriate
section for details concerning piping size, length, number of
elbows, furnace connections, and terminations.
Materials and Joining Methods
Two-three-inch nominal diameter PVC Schedule 40
pipe meeting ASTM D1785, PVC primer meeting ASTM
F656, and PVC solvent cement meeting ASTM D2564
specifications must be used. Fittings must be DWV type
fittings meeting ASTM D2665 and ASTM D3311. Carefully
follow the manufacturer’s instructions for cutting, cleaning,
and solvent cementing of PVC.
The use of Schedule 40 PVC cellular core DWV meeting
ASTM F891-1 or ABS cellular core (Foam Core) plastic pipe
is also acceptable as a flue/vent and intake pipe material.
PVC primer meeting ASTM F656 and PVC solvent cement
meeting ASTM D2564 specifications must be used. Fittings
must be DWV type fittings meeting ASTM D2665 and ASTM
D3311. Carefully follow the manufactures instructions for
cutting, cleaning and solvent cementing of PVC.
For Canadian installations: field supplied PVC venting
materials must be UL S636 listed.
NOTE:
Requirement does not apply to the combustion air
pipe.
As an alternative to PVC pipe, primer, solvent cement, and
fittings, ABS materials which are in compliance with the
following specifications may be used. Two-or-three-inch
ABS Schedule 40 pipe must meet ASTM D1527 and, if used
in Canada, must be CSA listed. Solvent cement for ABS to
ABS joints must meet ASTM D2235 and, if used in Canada,
must be CSA listed. The solvent cement for the PVC to ABS
transition joint must meet ASTM D3138. Fittings must be
DWV type fittings meeting ASTM D2661 and ASTM D3311
and, if used in Canada, must be CSA listed. Carefully follow
the manufacturers’ instructions for cutting, cleaning, and
solvent cementing PVC and/or ABS.
All 90° elbows must be medium radius (¼ bend DWV) or
long radius (Long sweep ¼ bend DWV) types conforming
to ASTM D3311. A medium radius (¼ bend DWV) elbow
measures 3 1/16” minimum from the plane of one opening to
the center line of the other opening for 2” diameter pipe, and
4 9/16” minimum for 3” pipe.
Proper Vent/Flue and Combustion
Air Piping Practices
Adhere to these instructions to ensure safe and proper
furnace performance. The length, diameter, and number of
elbows of the vent/flue pipe and combustion air pipe (when
applicable) affects the performance of the furnace and must
be carefully sized. All piping must be installed in accordance
with local codes and these instructions.
Some models require the use of 3” pipe. Do not transition
from a 2” to 3” pipe in a horizontal section of pipe as this may
create a water trap.
PREFERRED
Figure 4
