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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: EF100T199
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.
Unbalanced Direct Vent Systems
Air intake CAN NOT exceed exhaust
by more than 30 feet
Power Vented Systems
PVC, CPVC
Total length of exhaust piping must not exceed
“Maximum Vent Length”
Shown below
Maximum Vent Length (feet)
Model Number 3"
EF60T125, EF100T150 120'
EF60T150, EF100T199
EF60T199
EF100T300
100'
80'
60'
4"
170'
150'
130'
110'
EF100T399 50' 100'
EFR-1-60T120 60' 120'
2"
170'
30'
30'
30'
N/A
N/A
Balanced Direct Vent Systems
PVC, CPVC
Total length of intake piping and exhaust piping
added together must not exceed “Maximum
Combined Length”
Shown below
Maximum Combined Length (feet)
Model Number 3"
EF60T125, EF100T150 120'
EF60T150, EF100T199
EF100T250
EF100T300
100'
80'
60'
4"
170'
150'
130'
110'
EF100T399 50' 100'
EFR-1-60T120 60' 120'
2"
170'
30'
30'
N/A
N/A
N/A
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EF60T199 80' 130'30'
EF100T250 80' 130'N/A
WARNING! The EF100T250 and EF100T300 models are not
approved for 2 inch diameter vent pipe. Venting with 2 inch
pipe on these models may result in damage to the water heater
or cause an unsafe condition. DO NOT use 2 inch Vent or Air
Intake Pipe on EF100T250/300 models.
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