Installation / Operation Instruction Manual

19
Maximum Vent Length
Table 2 – Maximum Intake Vent Length
Model Number
Max 2” Vent
Length (feet)
Max 3" Vent
Length (feet)
Max 4" Vent
Length
(feet)
UCG100H199
20
50 75
UCG100H270
20
50
7
5
UCG100H399
N/A
25
50
UCG80H125 20 50 75
UCG80H199
20
50 75
UCG80H270
20
50
75
UCG8
0H399
N/A
25
50
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.