14
Termination Locations
12"
Non-Direct Vent
Vent/Flue Termination
No Terminations
Above Walkway
12"
min.
4'
min.
Non-Direct Vent
Vent/Flue Termination
Direct Vent
Vent/Flue Termination
<10'
Forced Air
Inlet
Non-Direct Vent
&
Direct Vent
Vent/Flue Terminations
Grade or Highest
Anticipated
Snow Level
3' min.
12" min.
4' min.
12" min.
Vent Termination Clearances
Figure 7
NOTE:
Refer to
Location Requirements and Considerations
for combustion air contaminant restrictions.
The following bullets and diagram describe the restrictions
concerning the appropriate location of vent/flue pipe and
combustion air intake pipe (when applicable) terminations.
Refer to
Non-Direct Vent (Single Pipe) Piping
and
Direct Vent
(Dual Pipe) Piping
located in this section for specific details
on termination construction.
• All terminations (flue and/or intake) must be located
at least 12 inches above ground level or the anticipated
snow level.
• Vent terminations (non-direct and direct vent) must
terminate at least 3 feet above any forced air inlet
located within 10 feet.
NOTE:
This provision does not apply to the
combustion air intake termination of a direct vent
application.
•
The vent termination of a
non-direct
vent
application
must terminate at least 4 feet below, 4 feet
horizontally from, or 1 foot above any door,
window, or gravity air inlet into any building.
• The vent termination of a
direct vent
application
must terminate at least 12 inches from any opening
through which flue gases may enter a building (door,
window, or gravity air inlet).
• The vent termination of vent pipe run vertically
through a roof must terminate at least 12 inches
above the roof line (or the anticipated snow level)
and be at least 12 inches from any vertical wall
(including any anticipated snow build up).
• A vent termination shall not terminate over public
walkways or over an area where condensate or
vapor could create a nuisance or hazard or could
be detrimental to the operation of regulators, relief
valves, or other equipment.
• The combustion air intake termination of a direct
vent application should not terminate in an area
which is frequently dusty or dirty.
NOTE:
In Canada, the current edition of CAN/CSA B149.1-
15 takes precedence over the preceding termination
description.
Canadian Vent Pipe & Combustion Air Pipe Re-
quirements
All installations in Canada must conform to the requirements
of CAN/CSA B149.1-15 code. All vent components,including
primer and cement, must be listed to ULC S636. The cer-
tified pipe and fittings should be clearly marked with the
ULC standard “S636”. The primer and cement used must
be of the same manufacturer as the vent system. For Royal
Pipe System 636; use GVS-65 Primer (Purple) and GVS-65
PVC Solvent Cement. For IPEX System 636, use PVC/CPVC
Primer, Purple or clear. Use PVC Solvent Cement (Gray).
For Canadian installations, ABS may be used as a combus-
tion air pipe only. ABS is not an approved vent material in
Canada. If ABS is used as a combustion air pipe, it must be
CSA certified. Always follow the manufacturer’s instruc
-
tions in the use of primer and cement. Do not use primer
and cement around potential sources of ignition. Do not
use primer or cement beyond its expiration date. The safe
operation, as defined by ULC S636, of the vent system is
based on following these installation instructions, the vent
system manufacturer’s installation instructions, and proper
use of primer and cement. It is recommended under this
standard, that the vent system be checked once a year by
qualified service personnel. All fire stops and roof flashings
used with this system must be UL listed. Acceptability under
CAN/CSA B149.1-15 is dependent upon full compliance with
all installation instructions. Consult the authority having
jurisdiction (gas inspection authority, municipal building
department, fire department, etc.) before installation to
determine the need to obtain a permit.
*IPEX System 636™
is a trademark of IPEX Inc.
Carefully follow the pipe manufacturers’ instructions for
cutting, cleaning, and solvent cementing PVC and/or ABS.
The vent can be run through an existing unused chimney
provided the space between the vent pipe and the chimney
is insulated and closed with a weather-tight, corrosion-re-
sistant flashing.
