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5. Terminate vent at least 6 ft away from adjacent
walls.
6. DO NOT terminate vent closer than 5 ft below roof
overhang.
7. The vent terminal requires a 12 in. vent terminal
clearance from the wall.
8. Terminate vent at least 1 ft above grade, including
normal snow line.
9. Multiple direct-vent installations require a 4 ft
clearance between the ends of vent caps located
on the same horizontal plane.
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 dwell-
ings and serves both dwellings.
2. Less than 7 ft (2.13 m) above a paved sidewalk or
paved driveway located on public property.
3. Within 6 ft (1.8 m) of a mechanical air supply inlet
to any building.
4. Above a meter/regulator assembly within 3 ft (915
mm) horizontally of the vertical centre-line of the
regulator.
5. Within 6 ft (1.8 m) of any gas service regulator
vent outlet.
6. Less than 1 ft (305 mm) above grade level.
7. Within 3 ft (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.
8. Underneath a verandah, porch or deck, unless
the verandah, porch or deck is fully open on a
mini-mum 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 ft (305 mm).
Venting Installation Tips
Support piping:
• horizontal runs—at least every 5 ft (1.5m)
• vertical runs—use braces
• under or near elbows
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.
Vertical Venting (Category IV)
Installation
The maximum and minimum venting length for this
Category IV appliance shall be determined per the
NFGC (U.S.) or B149 (Canada).
The diameter of vent flue pipe should be sized accord-
ing to the NFGC (U.S.) and Appendix B of B149
(Canada). The minimum flue pipe diameter for con-
ventional venting using Category IV, stainless steel UL
listed vent is: 10 in. (254mm) for Models 2505-3005;
and 12 in. (305mm) for Models 3505-4005.
The connection from the appliance vent to the stack
must be as direct as possible and shall be the same
di-ameter as the vent outlet. The horizontal breaching
of a vent must have an upward slope of not less than
1/4 inch per linear foot from the heater to the vent
terminal. The horizontal portions of the vent shall also
be supported for the design and weight of the material
employed to maintain clearances and to prevent physi-
cal damage or separation of joints.
WARNING:
Examine the venting system at least once
a year. Check all joints and vent pipe connections for
tightness, corrosion or deterioration.
CAUTION:
This venting system requires the
installation of a condensate drain in the vent piping
per the vent manufacturer’s instructions. Failure to
install a condensate drain in the venting system will
void all warranties on this heater.
WARNING:
The Commonwealth of Massachusetts
requires that sidewall vented heaters, installed in
every dwelling, building or structure used in whole
or in part for residential purposes, be installed using
special provisions as outlined on page 59 of this
manual.
