Bradford White eF Series Troubleshooting Manual And Instructions For Service page 9

Notes:
1) Multiply the total number of 90° elbows (intake and exhaust) by 5 feet. Do NOT include the
termination fittings or 3" condensate elbow.
2) Multiply the total number of 45° elbows (intake and exhaust) by 2 ½ feet.
3) Add this to the total length of straight pipe - intake and exhaust.
4) The sum total of all elbows and straight pipe - intake and exhaust must not exceed maximum
lengths from tables above.
Example: 100T199
A 3" balanced direct vent system has 30 feet of straight exhaust pipe and 30 feet of straight intake
pipe. It has 3- 90° elbows in the exhaust and 3- 90° elbows in the intake. It has 1- 45° elbow in
the exhaust and 1- 45° elbow in the intake.
Therefore:
6- 90° elbows x 5 feet = 30 feet.
2- 45° elbows x 2½ feet = 5 feet.
60 feet of straight pipe + 30 feet + 5 feet = 95 feet.
System is within "Maximum Combined Length" from table above.
Venting Tables Cont.
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