Through The Wall Venting With Low Ground Clearance:
When venting cannot exit through the wall at a height greater than or equal to 12 inches (30.5 cm) (and above expected snow level) from the ground, then the installation must be modified as shown below (see Figure 18). Refer to Tables 3 or 4 for maximum venting lengths using 2 inch (5.1 cm), 3 inch (7.6 cm) or 4 inch (10.2 cm) diameter plastic pipe.
Figure 18. Vent Terminal (Low Ground Clearance)
Maximum Vent Length Determination
Power Vent Maximum Vent Length
| Max Vent Length in feet | Max Vent Length in feet | Max Vent Length in |
Model | (meters) for 2 inch | (meters) for 3 inch | feet (meters) for 4 inch |
Number | (5.1 cm) PVC, CPVC, | (7.6 cm) PVC, CPVC, | (10.2 cm) PVC, CPVC, |
| or ABS | or ABS | or ABS |
EFR60T120, EF100T150 | 60 (18) | 120 (36) | 170 (51) |
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
55feet (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.
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