IMPORTANT: Ensure that all the coupling
clamps are firmly tight, then leak test the vent
system joints using a soap and water solution.
Repair any leak before allowing the water
heater to operate.
When using CPVC or ABS pipe and fittings,
use 90° elbows of the corresponding size and
material for the vent and combustion air-inlet
terminals. Install supplied wire mesh screens
into the CPVC or ABS vent and combustion
air-inlet terminal elbows.
The vent and combustion air-inlet terminals of
the water heater must be installed in the same
atmospheric pressure zone.
The minimum and maximum equivalent
lengths for the vent and combustion air-inlet
systems are shown in Table 1. Maintain a
minimum vertical height of 1 foot (3.5 cm) of
pipe from the blower exhaust before transi-
tioning in any elbow. The vent and combus-
tion air-inlet terminations are not included in
the equivalency calculations.
Notice: One (1), 90°, 1/4 standard bend elbow
is equivalent to 5 feet (1.52 meters) of straight
pipe and quantity one (1), 45°, 1/8 standard
bend elbow is equivalent to 2.5 feet (0.76
meters) of straight pipe.
DO NOT use short bend elbows.
13
Figure 1
2 in.
(5.1cm)
2 in.
(5.1cm)
Vent
Combustion
Air-Inlet
3 in. (7.6 cm)
2 in.
(5.1cm)
2 in. (5.1 cm)
Figure 2
3 in. (7.6 cm)
Vent
Combustion
Air-Inlet
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