Bradford White UCG100H199 Installation & Operation Manual page 18

Through The Wall Venting With Low Ground Clearance:
When venting cannot exit through the wall at a height greater than or equal to 12" (30.5 cm) (and above expected snow
level) from the ground, then the installation must be modified as shown below (see Figure 6).
Maximum Vent Length
Model Number
UCG100H199
UCG100H270
UCG100H399
Determining required vent length
1. Determine the total length of straight vent pipe (in feet) required for the intake.
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" on the venting table shown above.
Example of Total Vent Length for UCG100H199 installation:
A 3" venting system has a total of three 90-degree elbows and a total straight pipe length of 30 feet.
Equivalent vent length for elbows: 3 x 5 feet = 15 feet.
Total equivalent vent distance = 30 feet + 15 feet = 45 feet total equivalent vent length. This is below
the maximum allowed distance of 50 feet for this model using 3" vent.
Figure 6. Vent Terminal (Low Ground Clearance
Table 2. Maximum Intake Vent Length.
Max Vent
Length (feet) 2"
20
20
N/A
WARNING! DO NOT USE 2"
VENT WITH UCG100H399
MODELS
Max Vent
Length (feet) 3"
50
50
25
18
).
Max Vent
Length (feet) 4"
75
75
50