Bradford White EFTM Installation & Operating Manual page 28

Internet Version for Reference Only
Maximum Vent Length Determination
Determining required vent length:
1. Determine the total length of straight vent pipe (in feet) required.
2. Add 5 feet of venting for every 90° elbow.
3. Add 2 ½ feet 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" venting system has a total of six 90-degree elbows and a total straight pipe length of 55 feet.
Equivalent vent length for elbows: 6 x 5 feet = 30 feet.
Total equivalent vent distance = 55 feet + 30 feet = 85 feet total equivalent vent length. This is below
the maximum allowed distance of 100 feet for this model using 3" vent.
Do not include the 3" condensate elbow or vent terminals in determining maximum vent
length.
Figure 18. Vent Terminal (Low Ground Clearance)
Power Vent Maximum Vent Length
Model Max Vent Length (feet)
Number 3" PVC, CPVC, or ABS
EF60T125, EF100T150
EF60T150, EF100T199
EF60T199, EF100T250
EF100T300
EF100T399
Max Vent Length (feet)
4" PVC, CPVC, or ABS
120
100
80
60
50
Table 4
NOTICE
28
170
150
130
110
100