43
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 inlet pipe (direct vent/2-- pipe system only) and
vent pipe must terminate outside structure, either through sidewall
or roof.
Special termination requirements may be required in other
Canadian provinces. Refer to the authority having jurisdiction for
clarification and/or additional clearance requirements.
For vent termination clearance, references to National codes are
showninFig.51forDirectVent/2--PipesystemandFig.52for
Ventilated Combustion Air system. For exterior termination
arrangements, refer to Fig. 53 for Direct Vent/2 -- Pipe system and
Fig. 54 for Ventilated Combustion Air system. Contact Local
code authorities for other requirements to and/or exemptions from
the National codes shown in the figures.
Roof termination is the recommended termination location. Roof
terminations provide better performance against sustained
prevailing winds. The roof location is preferred since the vent and
combustion air system is less susceptible to damage or
contamination. The termination is usually located away from
adjacent structures or other obstacles such as inside corners,
windows, doors or other appliances. It is less prone to icing
conditions, and it often has less visible vent vapors.
Sidewall terminations may require sealing or shielding of building
surfaces with a corrosive resistance material due to the corrosive
properties of combustion products from the vent system, as well as
protection of adjacent structures.
RECOMMENDED SUPPORT FOR
VENT TERMINATIONS
It is recommended that sidewall vent terminations in excess of
24 inches (0.6 M) or rooftop terminations in excess of 36
inches (1 M) in vertical length be supported by EITHER the
Direct Vent Termination Kit shown in Table 10 or by
field -- supplied brackets or supports fastened to the structure.
NOTICE
When determining appropriate location for termination, consider
the following guidelines:
1. Comply with all clearance requirements stated in Fig. 51 or
Fig. 52 per application.
2. Termination or termination kit should be positioned where
vent vapors will not damage plants/shrubs, air conditioning
equipment or utility meters.
3. Do not locate termination directly into prevailing winds.
Termination should be positioned so that it will not be
affected by sustained prevailing winds over 30 mph, wind
eddy, such as inside building corners, or 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.
Inside corner vent terminations are permitted provided that (Fig.
46):
1. Only two exterior walls come together to form an angle of
90 degrees to 135 degrees. There are no other exterior walls
attached to either wall to form an alcove.
2. The vent termination must be located at least 3 feet from an
inside corner and follow the clearance distances in the In-
side Corner Termination drawing.
3. The clearance distances apply when the vent is at least 3
feet (1 meter) from, but not more than 6 feet (2 meters)
away from an inside corner.
4. For vent terminations located more than 6 feet (2 meters)
from an inside corner, refer to the appropriate Direct Vent
Clearance Table for all two pipe terminations or Non --
Direct Vent Clearance Table for all single pipe terminations.
5. The clearance distances to items between the vent
termination and the outside corner, refer to the appropriate
Direct Vent Clearance Table for all two pipe terminations or
Non--Direct Vent Clearance Table for all single pipe
terminations.
Direct Vent / 2-Pipe System
Direct vent (2--pipe) vent and combustion air pipes must terminate
outside the structure. See Fig. 51 for references to vent clearances
required by National Code Authorities. Allowable vent and
combustion air terminations are shown in Fig. 53.
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: Current edition of Section 9.3 NFPA
54/ANSI Z223.1, Air for Combustion and Ventilation and
applicable provisions of the local building codes.
Canadian Installations: Current edition of Part 8 of
CAN/CSA --B149.1. Venting Systems and Air Supply for
Appliances and all authorities having jurisdiction.
!
WARNING
Ventilated Combustion Air
The vent pipe for a Ventilated Combustion Air System must
terminate outdoors. See Fig. 52 For references to vent clearances
required by National code authorities. Allowable vent
terminations are shown in Fig. 54. The combustion air pipe
terminates in a well--ventilated attic or crawl space. Follow the
clearances as shown in Fig. 57.
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 Requir ements for the Provinces of Alberta and
Saskatchewan
The Provinces of Alberta and Saskatchewan require a minimum
unobstructed distance of 4 ft. (1.2 M) 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.
(1.2 M) 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. (2.4 M). All single, two-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 T ermination section above for locating the vent
termination
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