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Precautions should be taken to prevent condensate from freez-
ing inside the vent/flue pipe and/or at the vent/flue pipe
termination. All vent/flue piping exposed to temperatures
below 35°F for extended periods of time must be insulated
with 1/2" thick closed cell foam. Also, all vent/flue piping
exposed outdoors in excess of the terminations shown in this
manual (or in unheated areas) must be insulated with 1/2"
thick closed cell foam. Inspect piping for leaks prior to in-
stalling insulation.
T
L
ERMINATION
OCATIONS
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 com-
bustion 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 ter-
mination 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 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 running 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.
NO TRANSITION ON
HORIZONTAL PLANE,
THIS CREATES A
WATER TRAP AND
RESTRICTS FLUE
GASES
Figure 8
•
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
restriction.
C
V
P
& C
ANADIAN
ENT
IPE
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 certi-
fied 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 Sol-
vent 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 instruc-
tions, the vent system manufacturer's installation instruc-
tions, and proper use of primer and cement. It is recom-
mended 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 in-
structions. 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 pro-
vided the space between the vent pipe and the chimney is insu-
lated and closed with a weather-tight, corrosion-resistant flash-
ing.
A
P
R
OMBUSTION
IR
IPE
EQUIREMENTS
17
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