Bradford White EF120T Installation & Operation Manual With Troubleshooting Manual page 27

Maximum Vent Length
Table 3 – Power Direct Vent and Power Vent Maximum Vent Length
3 in. Vent Pipe
Max. Intake Length
Max. Exhaust Length
4 in. Vent Pipe
Max. Intake Length
Max. Exhaust Length
6 in. Vent Pipe
Max. Intake Length
Max. Exhaust Length
3 in. Vent Pipe
Max. Intake Length
Max. Exhaust Length
4 in. Vent Pipe
Max. Intake Length
Max. Exhaust Length
6 in. Vent Pipe
Max. Intake Length
Max. Exhaust Length
Note: The venting distance shown in the charts above is the combined maximum distance for the intake and
exhaust pipe and elbows. The intake and exhaust vent terminals may be in different locations (i.e., different
walls or one wall, one roof) provided that the intake equivalent venting distance does not exceed the exhaust
by more than 30 ft (9.2 m).
Determining Required Vent Length
1. Determine the total length of straight vent pipe (in feet) required for both the intake and the exhaust.
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 maximum vent length in Table 3.
5. Air intake CANNOT exceed exhaust by more than 30 ft (9.2 m) in any venting situation.
Example of Total Power Direct Vent Length for 120T400:
A 4 in (10.2 cm) venting system has a total of six 90° elbows and a total straight pipe length of 65 ft (19.8 m)
(includes both intake and exhaust pipe). Equivalent vent length for elbows: 6 x 5 ft = 30 ft (9.2 m). Total
equivalent vent distance = 65 ft (19.8 m) + 30 ft (9.2 m) = 95 ft (29 m) total equivalent vent length. This is
below the maximum allowed distance of 200 feet for this model using 4 in (10.2 cm) vent.
DO NOT include the 4 in (10.2 cm) condensate elbow or vent terminals in determining maximum vent length.
(Combined Maximum Length for Intake and Exhaust)
120T-400-3N(A) 399,999 BTU/hr
Power Direct Vent
65 ft.
65 ft.
Power Direct Vent
100 ft.
100 ft.
Power Direct Vent
120 ft.
120 ft.
SI UNIT Equivalent
120T-400-3N(A) 399,999 BTU/hr
Power Direct Vent
19.8 m
19.8 m
Power Direct Vent
30.5 m
30.5 m
Power Direct Vent
36.6 m
36.6 m
Power Vent Power Direct Vent
N/A
65 ft.
Power Vent Power Direct Vent
N/A
100 ft.
Power Vent Power Direct Vent
N/A
120 ft.
Power Vent Power Direct Vent
N/A
19.8 m
Power Vent Power Direct Vent
N/A
30.5 m
Power Vent Power Direct Vent
N/A
36.6 m
NOTICE
27
120T-500-3N(A) 499,000 BTU/hr
Power Vent
65 ft.
65 ft.
Power Vent
100 ft.
100 ft.
Power Vent
120 ft.
120 ft.
120T-500-3N(A) 499,000 BTU/hr
Power Vent
19.8 m
19.8 m
Power Vent
30.5 m
30.5 m
Power Vent
36.6 m
36.6 m
N/A
65 ft.
N/A
100 ft.
N/A
120 ft.
N/A
19.8 m
N/A
30.5 m
N/A
36.6 m