Power Vent Maximum Vent Length

Figure 18. Vent Terminal (Low Ground Clearance)

Maximum Vent Length Determination

	Max Vent Length feet	Max Vent Length feet
	Max Vent Length feet	(meters) 4 inch (10.2
Model	(meters) 3 inch (7.6 cm)	(meters) 4 inch (10.2
Model	PVC, CPVC, or ABS	cm) PVC, CPVC, or
Number	PVC, CPVC, or ABS	ABS
Number		ABS
EF60T125, EF100T150	120 (36.6)	170 (51.9)
EF60T150, EF100T199	100 (30.5)	150 (45.7)
EF60T199, EF100T250	80 (24.4)	130 (39.6)
EF100T300	60 (18.3)	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.

EF specifications

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