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13
Maximum and Minimum Vent Lengths
Models
Ambient Installation Temperatures and Vent System Material Specications
Below 100°F (38°C) 100°F (38°C) to 125°F (52°C)
0 to 10 ft.
Equivalent Vent
System Length
10 ft. to Max
Equivalent Vent
System Length
0 to 20 ft.
Equivalent Vent
System Length
20 ft. to Max
Equivalent Vent
System Length
75 Gallon
CPVC or ABS PVC,CPVC or ABS CPVC or ABS PVC,CPVC or ABS
Read these instructions thoroughly and make sure you
understand all steps and procedures before proceeding
with the installation.
1. Connect the vent system piping to the blower as-
sembly using the already installed 3 in. diameter blower
exhaust coupling and clamps.
2. For vent terminal use the 3 in. diameter, Schedule
40, PVC, 90°, 1/4 standard bend elbow supplied with
the appliance (See Figure 1).
This appliance may also be installed with 4 in. diameter
pipe and ttings for the vent system.
To connect the vent system piping,
• Install a 12 in. length of 3 in. diameter pipe verti-
cally to the blower exhaust coupling on the blower
assembly,
• Followed by a 3 in. to 4 in. diameter pipe increaser
tting (See Figure 2).
For vent terminal,
• Use 4 in. diameter, Schedule 40, PVC, 90°, 1/4 stan-
dard bend elbows (not supplied).
DO NOT use unequal diameters of pipe and ttings for
the vent system except as dened previously.
IMPORTANT: Ensure that all the coupling clamps
are tight before allowing the appliance to operate.
When using ABS (US only) or CPVC pipe and ttings,
use 90° elbows of the corresponding size and material
for the vent terminal.
Screens for the 3 & 4 in. vent terminals have been sup-
plied with the appliance.
The minimum and maximum equivalent lengths for the
vent system are shown in Table 1.
• Maintain a minimum vertical height of 1 ft. of pipe,
including pipe increasers (if used), from the blower
exhaust coupling before transitioning into any elbow.
• The vent termination is not included in the equiva-
lency calculations.
NOTICE: A 90°, 1/4 standard bend or long bend
elbow is equivalent to 5 ft. of straight pipe. A 45°, 1/8
standard bend or long bend elbow is equivalent to
2.5 ft. of straight pipe.
DO NOT use short bend elbows. Use only standard
and/or long bend elbows. See examples.
Additional PVC Fittings Considerations
DO NOT Use
Short Sweep 90° Elbow
Long Sweep 90° Elbow
Best
Good
Standard 90° Elbow
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