Bradford White UCG100H199 Installation & Operation Manual page 19

Maximum Vent Length
Model Number
UCG100H199
UCG100H270
UCG100H399
UCG80H125
UCG80H199
UCG80H270
UCG80H399
Determining Required Vent Length
1. Determine the total length of straight vent pipe (in feet) required for the intake.
2. Add 5 ft (1.52 m) of venting for every 90° elbow.
3. Add 2 ½ ft (.76 m) 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 in (7.6 cm) venting system has a total of three 90° elbows and a total straight pipe length of 30 ft (9.2 m).
Equivalent vent length for elbows: 3 x 5 feet = 15 feet (4.5 m).
Total equivalent vent distance = 30 feet + 15 feet = 45 feet (13.7 m) total equivalent vent length. This is
below the maximum allowed distance of 50 feet (15.2 m) for this model using 3 in vent.
Table 2 – Maximum Intake Vent Length
Max 2" Vent
Length (feet)
20
20
N/A
20
20
20
N/A
19
Max 3" Vent
Length (feet)
50
50
25
50
50
50
25
Max 4" Vent
Length (feet)
75
75
50
75
75
75
50