INSTALLATION INSTRUCTIONS
Gas Furnace: (F/G)MAC
440 01 4201 01
37
Specifications subject to change without notice.
Locating the Vent Termination
General
NOTE: Termination Requirements for the Provinces of
Alberta and Saskatchewan are located at the end of this
section.
Combustion
−
air (Direct vent/2
−
pipe system only) and vent pipe
must terminate outside structure, either through sidewall or
roof.
For vent termination clearance, refer to
Figure 59
for Direct
Vent/2
−
Pipe system and
Figure 60
for Non
−
direct
Vent/Ventilated Combustion Air system. For exterior termination
arrangements, refer to
Figure 59
for Direct Vent/2
−
Pipe system
and
Figure 60
for Non
−
Direct/Ventilated Combustion Air
system.
Roof termination is preferred since it is less susceptible to
damage or contamination, and it has less visible vent vapors.
Sidewall terminations require sealing or shielding of building
surfaces with a corrosive resistance material due to corrosive
combustion products of vent system.
NOTE
: (Direct Vent/2
−
Pipe system ONLY) A factory accessory
termination kit MUST be used.
When determining appropriate location for termination, consider
the following guidelines:
1. Comply with all clearance requirements stated in
Figure 59
or
Figure 60
per application.
2. Termination or termination kit should be positioned where
vent vapors will not damage plants/shrubs or air
conditioning equipment.
3. Termination or termination kit should be positioned so
that it will not be affected by wind eddy, such as inside
building corners, nor by recirculation of flue gases,
airborne leaves, or light snow.
4. Termination or termination kit should be positioned where
it will not be damaged by or subjected to foreign objects
such as stones, balls, etc.
5. Termination or termination kit should be positioned where
vent vapors are not objectionable.
Direct Vent / 2
−
Pipe System
Direct vent (2
−
pipe) vent and combustion air pipes must
terminate outside the structure. Follow all clearances as shown
Figure 59
. Allowable vent and combustion air terminations are
shown in
Figure 52
.
Ventilated Combustion Air
The vent pipe for a Ventilated Combustion Air System must
terminate outdoors. Follow all vent termination clearances
shown in
Figure 60
. Allowable vent terminations are shown in
Figure 53
. The combustion air pipe terminates in a
well
−
ventilated attic or crawl space. When the furnace is
installed in a well ventilated attic or crawlspace, install the
combustion air pipe as shown in
Figure 49
. Follow the
clearances as shown in
Figure 57
and
Figure 58
.
The combustion air pipe cannot terminate in attics or crawl
spaces that use ventilation fans designed to operate in the
heating season. If ventilation fans are present in these areas,
the combustion air pipe must terminate outdoors as a Direct
Vent System.
Termination Requirements for the
Provinces of Alberta and Saskatchewan
The Provinces of Alberta and Saskatchewan require a
minimum unobstructed distance of 4 ft. (1.2m) from the
foundation to the property line of the adjacent lot for vent
termination of any appliance with an input over 35,000 btuh. If
there is less than 4 ft. (1.2m) of unobstructed distance to the
property line of the adjacent lot, no type of vent termination is
permitted for appliances with inputs greater than 35,000 btuh.
There are no additional restrictions on unobstructed distances
greater than 8 ft. (2.4m). All single, 2-pipe and concentric vents
may be used, providing all other Code and manufacturer’s
requirements in these instructions are adhered to. Refer to the
appropriate
Vent Termination
section above for locating the
vent termination .
If the unobstructed distance from the foundation to the property
line of the adjacent lot is no less than 4 ft. (1.2m) and no
greater than 8 ft. (2.4m), it will be necessary to re-direct the flue
gas plume. In this situation, a concentric vent kit cannot be
used. A 2-pipe termination (or single pipe termination when
permitted) that re-directs the flue gas away by use of an elbow
or tee, certified to ULC S636
from the adjacent property line
must be used. (See
Figure 50
and
Figure 51
)
The concentric vent kit currently cannot be modified to attach
an elbow to the vent portion of the rain cap. A tee attached to
the rain cap could potentially direct the flue gas plume toward
the intake air stream and contaminate the incoming combustion
air for the furnace.
Refer to
Figure 50
and
Figure 51
for terminations approved for
use in Alberta and Saskatchewan.
Figure 50
Tee at Termination Outlet
12
−
in
30.48 cm
Above anticipated
snow level
12
−
in
30.48 cm
L10F024
