39
D. EXHAUST AND INTAKE AIR VENT SIZING
1. The exhaust and intake vent size is 2” for the PHE130 and 3” for the PHE199.
2. The total combined equivalent length of exhaust and intake air vents should not exceed 85 ft.
a. The equivalent length of elbows, tees, and other fittings are listen in the Friction Loss Table
below.
FRICTION LOSS EQUIVALENT IN PIPING AND FITTINGS
FITTINGS OR PIPING
EQUIVALENT FEET
2”
3”
4”
90 DEGREE ELBOW*
5’
5’
3’
45 DEGREE ELBOW
3’
3’
1’
COUPLING
0’
0’
0’
AIR INLET TEE
0’
0’
0’
STRAIGHT PIPE
1’
1’
1’
CONCENTRIC VENT KIT
3’
3’
N/A
V500 2” VENT KIT
1’
N/A
N/A
V1000 3” VENT KIT
N/A
1’
1’
V2000 4” VENT KIT
N/A
1’
1’
Table 7 - *Friction loss for long radius elbow is 1’ less.
b. For example: If the exhaust vent has two 90
o
elbows and 10 ft of PVC pipe, we will calculate:
Exhaust Vent Pipe Equivalent Length = (2x5) + 10 = 20 ft.
Further, if the intake air vent pipe has two 90o elbows, one 45o elbow, and 10 ft of PVC pipe, the
following calculation applies:
Intake Air Vent Pipe Equivalent Length = (2x5) + 3 + 10 = 23 ft.
Therefore, the total combined equivalent length is 46 ft, which is well below the maximum of 85 ft.
c. The intake air and exhaust vents are intended to penetrate the same wall or roof of the
building.
d. Effort should be made to keep a minimum difference in equivalent length between the intake
air and exhaust vents.
3. The minimum combined equivalent length is 16 equivalent feet.
E. LONGER VENT RUNS
1. The maximum combined equivalent length can be extended by increasing the diameter of both the
exhaust and intake air vents equally. However, the transitions should begin a minimum of 15 equivalent
feet from the water heater.
a. The maximum equivalent length for the increased diameter vents is 125 ft.
b. To prevent condensate from pooling in the vent pipe, transitions should always be made in
vertical sections.
Vent Connection
Reducing Coupling
Vent Transition
2”
3” x 2”
3”
3”
4” x 3”
4”
Table 8
c. If the transition occurs at a distance greater than 15 equivalent feet from the water heater, the
maximum equivalent length will be reduced. See Table 7.
Содержание Versa Hydro PHE130-119
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