SYSTEM OPERATION
13
Some models require the use of 3” pipe. Do not transition
from a 2” to 3” pipe in a horizontal section of pipe as this may
create a water trap.
Piping must be adequately secured and supported to prohibit
sagging, joint separation, and/or detachment from the furnace.
Horizontal runs of vent/flue piping must be supported every three
to five feet and must maintain a 1/4 inch per foot downward slope,
back towards the furnace, to properly return condensate to the
furnace’s drain system. Allowances should be made for minor
expansion and contraction due to temperature variations. For
this reason, particular care must be taken to secure piping when
a long run is followed by a short offset of less than 40 inches.
Precautions should be taken to prevent condensate from freezing
inside the vent/flue pipe and/or at the vent/flue pipe termination. All
vent/flue piping exposed to freezing 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 installing insulation.
Termination Locations
Non-Direct Vent
Vent/Flue Termination
No Terminations
Above Walkway
4'
min.
Non-Direct Vent
Vent/Flue Termination
Direct Vent
Vent/Flue Termination
Forced Air
Inlet
Non-Direct Vent
&
Direct Vent
Vent/Flue Terminations
Grade or Highest
Anticipated
Snow Level
12" min.
4' min.
12" min.
Vent Termination Clearances
Figure 7
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 certified
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 combustion
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 instructions 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.
