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Combustion Air
Supply
From Inside Building
(Non-Direct Venting)
From Outside Building
(Direct Venting)
* Only Centrotherm polypropylene material is approved for use with the XTherm.
3.15.2. Canadian Installations
Refer to latest edition of the B149 Installation Code.
A vent shall not terminate:
1. Directly above a paved sidewalk or driveway which
is located between two single-family dwellings and
serves both dwellings.
2. Within 6' (1.8 m) of a mechanical air supply inlet to
any building.
3. Above a meter/regulator assembly within 3' (915 mm)
horizontally of the vertical centre-line of the regulator.
4. Within 6' (1.8 m) of any gas service regulator vent
outlet.
5. Less than 1' (305 mm) above grade level.
6. Within 3' (915 mm) of a window or door which can
be opened in any building, any non-mechanical air
supply inlet to any building or the combustion air
inlet of any other appliance.
7. Underneath a verandah, porch or deck, unless the
verandah, porch or deck is fully open on a minimum
of two sides beneath the floor, and the distance
between the top of the vent termination and the
underside of the verandah, porch or deck is greater
than 1' (305 mm).
Certified
Model
No.
Material
1005A
Category IV
Stainless Steel
1505A
2005A
Polypropylene***
1 Vent lengths are based on a lateral length of 2 ft. (0.6 m) Refer to the latest edition of the NFGC for further details.
2 Consult factory for longer vent runs .
* Subtract 10 ft (3 m) per elbow. Max. 4 elbows.
** Adapters supplied by others.
*** Only Centrotherm™ polypropylene material is approved for use with the XTherm.
Exhaust Configuration
Vertical Venting
Horizontal Through-
the-Wall Venting
Vertical Venting
Horizontal Through-
the-Wall Venting
Table P.
Venting Category Requirements
Vent Size
Vent
(in.)
6
PVC
CPVC
8
Table Q.
Heater Venting
Certified Materials
Category
IV
3.16. Venting Installation Tips
Support piping (See vent manufacturers instructions):
•
horizontal runs—at least every 5' (1.5 m)
•
vertical runs—use braces at least every 10' (3 m)
•
under or near elbows
WARNING: Examine the venting system at least once
A
a year. Check all joints and vent pipe connections for
tightness, corrosion or deterioration.
3.17. Vertical Venting Configurations
For heaters connected to gas vents or chimneys, vent
installations shall be in accordance with the NFGC (U.S.),
or B149 (Canada), or applicable provisions of local building
codes.
CAUTION: This venting system may require the
A
installation of supplemental condensate drains in the vent
piping per the vent manufacturer's instructions. Failure to
install these condensate drains in the venting system may
cause a non-warrantable failure. Condensate must not be
allowed to freeze. Take appropriate measures.
Total Effective
Combustion Air
Length1 (ft/m)*
Intake Pipe
Material
Min.
Max.
Galvanized Steel,
PVC,
75
2
0
ABS,
(23
)
2
CPVC
Category IV Vertical Venting
Combustion Air Inlet
CAT IV
Stainless Steel
PVC
Galvanized Steel
CPVC
Polypropylene*
Air Inlet
Max. Length* (ft/m)
6" Ø
8" Ø
45
100**
(14)
(30)
45
(14)
Material
PVC
ABS
CPVC
10" Ø
85**
(26)
31
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