41
local code, the current edition of the National Fuel Gas Code, and
the vent or liner manufacturer’s installation instructions. Care must
be taken to prevent the exhaust gases from one appliance from
contaminating the combustion air of other gas appliances.
Do not take combustion air from inside the chimney when using
ventilated combustion air or single--pipe vent option.
These furnaces can be vented as direct--vent (two--pipe), ventilated
combustion air or non-direct (single--pipe) vent system. Each type
of venting system is described below. Common venting between
these furnaces or other appliances is prohibited.
Materials
U.S.A.
Combustion air and vent pipe, fittings, primers, and solvents must
conform to American National Standards Institute (ANSI)
standards and American Society for Testing and Materials (ASTM)
standards. See Table 14 for approved materials for use in the
U.S.A. This furnace is also CSA approved for venting with M&G
DuraVent
R
PolyPro
R
polypropylene venting systems.
Canada
Special Venting Requirements for Installations in Canada,
Installation in Canada must conform to the requirements of
CAN/CSA B149 code. Vent systems
must
be composed of pipe,
fittings, cements, and primers listed to ULC S636. M&G DuraVent
PolyPro polypropylene venting systems are ULC S636 listed.
NOTE
: When using polypropylene venting systems, all venting
materials used, including the vent terminations must be from the
same manufacturer.
Venting Systems
CARBON MONOXIDE POISONING HAZARD
Failure to follow the instructions outlined below for each
appliance being placed into operation could result in carbon
monoxide poisoning or death.
For all venting configurations for this appliance and other gas
appliances placed into operation for this structure, provisions
for adequate combustion, ventilation, and dilution air must be
provided in accordance with:
U.S.A. Installations
: Section 9.3 of current edition of NFPA
54/ANSI Z223.1, Air for Combustion and Ventilation and
applicable provisions of the local building codes.
Canadian Installations
:
Part 8 of current edition of
CAN/CSA--B149.1. Venting Systems and Air Supply for
Appliances and all authorities having jurisdiction.
!
WARNING
RECOMMENDED SUPPORT FOR
VENT TERMINATION
It is recommended that sidewall vent terminations of over 24
inches (0.6 M) in length or rooftop vent terminations of over
36 inches (1 M) in length be supported by EITHER the
factory accessory vent termination kit or field--supplied
brackets or supports attached to the structure. A factory
accessory vent termination kit may be used for direct vent
terminations. Termination kits are available for 2--in. or 3--in.
pipe. See Table 12 for available options.
NOTICE
Table 12 – Vent Termination Kit for Direct Vent (2--pipe) Systems
Vent and
Combustion Air
Pipe Diameters
Approved Two- Pipe Termination Fittings
Allowable
Concentric Vent
Kit
1 1/2--in.
(38 mm)
2--in.
(51 mm)
2 1/2--in.
(64 mm)
3--in.
(76--mm)
4--in.
(102 mm)
1 1/2--in. (38 mm)
No
Yes
No
No
No
2--in. (51 mm)
2--in. (51 mm)
No
Yes
No
No
No
2--in. (51 mm)
2 1/2--in. (64 mm)
No
No
No
Yes
No
2--in. (51 mm)
3--in. (76 mm)
3--in. (76--mm)
No
No
No
Yes
No
3--in. (76 mm)
4--in. (102 mm)
No
No
No
Yes
Yes
3--in. (76 mm)
Direct Vent / 2-Pipe System
In a direct-vent (2-pipe) system, all air for combustion is taken
directly from outdoor atmosphere, and all flue products are
discharged to outdoor atmosphere. Combustion-air and vent pipes
must terminate together in the same atmospheric pressure zone,
either through the roof (preferred) or a sidewall. See Fig. 53 for
references to clearances required by National code authorities.
OPTIONAL CONFIGURATION FOR COMBUSTION
AIR INLET PIPE
In applications where there is a risk of excessive moisture
entering the combustion air inlet pipe, a moisture trap may be
added to the inlet pipe to help prevent moisture from entering
the furnace from the combustion air inlet pipe. See Fig. 41.
When sizing venting systems, the equivalent length of the
optional inlet pipe moisture trap must be taken into account.
NOTICE
Ventilated Combustion Air Systems
In a ventilated combustion air option, the vent terminates and
discharges the flue products directly to the outdoors similar to a
direct vent system. See Fig. 54 for references to clearances required
by National code authorities.
All air for combustion is piped directly to the furnace from a space
that is well ventilated with outdoor air (such as an attic or crawl
space) and the space is well isolated from the living space or
garage. Combustion air requirements for this option are the same as
the requirements for providing outside air for combustion for a
single pipe vent system. Refer to the “Air For Combustion and
Ventilation” Section.
Non-Direct Vent (1-pipe) System
In a non direct-vent (1-pipe) system, all air for combustion is taken
from the area adjacent to furnace, and all flue products are
discharged to outdoor atmosphere. Air for combustion must be
supplied as described in the Air For Combustion and Ventilation
Section. Do not use an abandoned chimney to supply outside air to
the furnace. See Fig. 54 for references to vent clearances required
by National code authorities.
