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supply inlet to any building or the combustion air inlet
of any other appliance.
8. Underneath a veranda, porch or deck, unless the
veranda, 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 veranda, porch or deck is greater than 1 ft (305
mm).
Venting Installation Tips
Support piping:
•
horizontal runs—at least every 5 ft (1.5 m)
•
vertical runs—use braces
•
under or near elbows
Venting Configurations
A
WARNING: Examine the venting system at least
once a year. Check all joints and vent pipe connections
for tightness, corrosion or deterioration.
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).
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. The drain line must not be allowed to freeze. Take
appropriate measures.
Certified
Model
Vent
Material
503A
753A
1003A
Category IV
1253A
UL listed - SS
1503A
1753A
2003A
¹ Special vent materials are still required.
² Subtract 10 ft (3 m) per elbow. Max. 4 elbows.
³ Adapters supplied by others.
26
Max. Vertical Vent
Vent Size
Height¹
(in)
ft (m)
6
75 (22.9)²
8
Table J.
Category IV Vertical Venting
The diameter of vent flue pipe should be sized according
to the NFGC (U.S.) and Appendix B of B149 (Canada).
The minimum flue pipe diameter for conventional venting
using Category IV, stainless steel UL listed - SS vent is: 6
in. (254 mm) for Models 503A - 1003A; and 8 in. (305 mm)
for Models 1253A - 2003A.
CAT IV VENT PIPE
FILTER
HEATER UNIT
F10681
Figure 25. Vertical Venting
The connection from the appliance vent to the stack must
be as direct as possible and shall be the same diameter
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
Combustion Air
Intake Pipe
Material
6" Ø
45 (13.7)
Galvanized Steel,
PVC,
ABS,
CPVC
N/A
8' OR LESS
(2.4 m)
2' MIN
(610 mm)
2' MIN
(610 mm)
TEST PORT
CONDENSATION TRAP
Air Inlet Max. Length²
ft (m)
8" Ø
10" Ø
100 (30.5)³
N/A
45 (13.7)
85 (25.9)³
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