Maximum Vent Length Determination; Power Vent Maximum Vent Length - Bradford White EF Series Installation & Operating Manual

Maximum Vent Length Determination

Number
EF60T125, EF100T150
EF60T150, EF100T199
EF60T199
EF100T250
EF100T300
The EF100T250 and EF100T300 models are not approved for 2 inch diameter vent pipe. Venting with 2 inch pipe on
these models may result in damage to the water heater or cause an unsafe condition. DO NOT use 2 inch Vent or
Air Intake Pipe on EF100T250/300 models.
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.
WARNING! DO NOT USE 2" VENT WITH EF100T250/300 MODELS
Figure 17. Vent Terminal (Low Ground Clearance)

Power Vent Maximum Vent Length

Model Max Vent
Length (feet) 2"
Max Vent
Length (feet) 3"
30
120
30
100
30 80
N/A
80
N/A
60
Table 4
WARNING
NOTICE
29
Max Vent Length
(feet) 4"
170
150
130
130
110