Bradford White EF120T Installation & Operation Manual With Troubleshooting Manual page 30

Through the Wall Venting with Low Ground Clearance
When venting cannot exit through the wall at a height greater than or equal to 12 in (30 cm) from the ground and
12 in (30 cm) above expected snowfall, then the installation must be modified as shown below (see Figure 18).
Refer to Table 3 (page 27) for maximum venting lengths using 4 in (10.2 cm) or 6 in (15.2 cm) diameter plastic
pipe.
Maximum Vent Length Determination
Reference Table 3 on page 27 for Maximum Vent Length Tables.
Determining Required Vent Length
1. Determine the total length of straight vent pipe (in feet) required.
2. Add 5 ft (1.5 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.
Example Of Total Vent Length For 120T400 With A Power Vented Installation
A 3 in (7.6 cm) venting system has a total of six 90° elbows and a total straight pipe length of 35 ft (10.7 m).
Equivalent vent length for elbows: 6 x 5 feet = 30 feet (9.2 m).
Total equivalent vent distance = 35 feet + 30 feet = 65 feet (19.8 m) total equivalent vent length. This is
below/equal to the maximum allowed distance of 65 feet (19.8 m) for this model using 3" vent
DO NOT include the 3 in (7.6 cm) condensate elbow or vent terminals in determining maximum vent
length.
Figure 18 – Vent Terminal (Low Ground Clearance)
NOTICE
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