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Figure 18. Vent Terminal (Low Ground Clearance)
Maximum Vent Length Determination
Power Vent Maximum Vent Length
Model
Number
Max Vent Length feet
(meters) 3 inch (7.6 cm)
PVC, CPVC, or ABS
Max Vent Length feet
(meters) 4 inch (10.2
cm) PVC, CPVC, or
ABS
EF60T125, EF100T150 120 (36.6) 170 (51.9)
EF60T150, EF100T199 100 (30.5) 150 (45.7)
EF60T199, EF100T250
EF100T300
80 (24.4)
60 (18.3)
130 (39.6)
110 (33.5)
EF100T399 50 (15.2) 100 (30.5)
Table 4
Determining required vent length:
1. Determine the total length of straight vent pipe (in feet) required.
2. Add 5 feet (1.5 m) of venting for every 90° elbow.
3. Add 2 ½ feet (.7 m) of venting for every 45° elbow.
4. Total vent length cannot exceed “Max. Vent Length” in Table 4.
Example of Total Vent Length for EF100T199 with a power vented installation:
A 3 inch (7.6 cm) venting system has a total of six 90-degree elbows and a total straight pipe length of 55 feet (16.5 m).
Equivalent vent length for elbows: 6 x 5 feet (1.5 m) = 30 feet (9 m).
Total equivalent vent distance = 55 feet (16.5 m) + 30 feet (9 m) = 85 feet (25.5 m) total equivalent vent length. This is
below the maximum allowed distance of 100 feet (30 m) for this model using 3 inch (7.6 cm) vent.
NOTICE
Do not include the 3 inch (7.6 cm) condensate elbow or vent terminals in determining
maximum vent length.