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D. EXHAUST VENT AND INTAKE AIR PIPE
SIZING
1. For the T50 and T80 Boilers the exhaust vent
and air intake pipes should be 2" Schedule 40
or 80.
2. For the 80M, 140M, 199M the exhaust vent
and air intake pipes should be 3" Schedule 40
or 80.
3. The total combined equivalent length of
exhaust vent and intake air pipe should not
exceed 85 feet.
a. The equivalent length of elbows, tees, and
other fittings are listed in the Friction Loss
Table 4.1.
Table 4.1
FRICTION LOSS EQUIVALENT IN PIPING AND FITTINGS
FITTINGS OR PIPING
90 DEGREE ELBOW*
45 DEGREE ELBOW
COUPLING
AIR INLET TEE
STRAIGHT PIPE
CONCENTRIC VENT KIT
V500 2" VENT KIT
V1000 3" VENT KIT
V2000 4" VENT KIT
*Friction loss for long radius elbow is 1 foot less.
b. For example: If the exhaust vent has two 90°
elbows and 10 feet of PVC pipe we will cal-
culate:
Exhaust Vent Pipe Equivalent Length = (2x5)+10=20 feet
Further, if the intake air pipe has two 90°
elbows, one 45° elbow and 10 feet of PVC
pipe, the following calculation applies:
Air Intake Pipe Equivalent Length = (2x5)+3+10=23 feet
Finally, if a concentric vent kit is used we
find:
Total Combined Equivalent Length = 20+23+3=46 feet
Therefore, the total combined equivalent
length is 46 feet which is well below the
maximum of 85 feet.
c. The intake air pipe and the exhaust vent 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
air intake pipe and the exhaust vent.
16
EQUIVALENT FEET
2"
3"
4"
6"
1'
5'
5'
3'
3'
3'
1'
1'
0'
0'
0'
0'
0'
0'
0'
0'
1'
1'
1'
0.5
3'
3'
N/A
N/A
1'
N/A
N/A
N/A
N/A
1'
N/A
N/A
N/A
N/A
1'
N/A
4. The minimum combined equivalent length is
16 equivalent feet.
5. The maximum combined equivalent length
can be extended by increasing the diameter
of the vent pipe. However, the transitions
should begin a minimum of 15 equivalent feet
from the boiler.
a. Transitions should always be made in verti-
cal sections of pipe to prevent the conden-
sate from pooling in the vent pipe.
b. Use a 3" x 2" reducing coupling to transition
from the T50 and T80 boiler connections to
a 3" vent.
c. Use a 4" x 3" reducing coupling to transition
from the 80M, 140M, and 199M boiler con-
nections to 4" vent.
d. The maximum equivalent length for the
increased diameter vent pipes is 125 feet.
e. If the transition occurs at a distance greater
than 15 equivalent feet from the boiler, the
maximum equivalent length will be reduced.
See Table 4.2. Standard Vent Pipe is 2" and
Oversized Vent Pipe is 3" for T50 and T80.
Standard Vent Pipe is 3" and Oversized Vent
Pipe is 4" for 80M through 199M.
Table 4.2: Vent Termination Kits
Transition
TEL of
Point
Standard 2"
(ft from
or 3" Vent
boiler
Pipe (ft)
15
30
20
40
25
50
30
60
35
70
40
80
None
85
TEL = Total Equivalent Length
E. EXHAUST VENT AND AIR INTAKE PIPE
INSTALLATION
1. On the T50 and T80 the 2" exhaust vent con-
nection is located on the top, right side of the
boiler and the air intake is on the top, left side.
See Figure 10.1. The air intake connection is
intended for a slip fit. No sealant or adhesive
is required.
2. On the 80M, 140M, and 199M Boilers the 3"
exhaust vent connection is located on the rear
of the boiler and the air intake is higher and
toward the left side when the boiler is viewed
from the front. The air intake connection is
intended for a slip fit. No sealant or adhesive
is required.
VENTING
TEL of
Maximum
Oversized 3"
TEL of all
or 4" Vent
Vent Pipe (ft)
Pipe (ft)
95
125
77-1/2
117-1/2
60-1/2
110-1/2
43
103
26
96
8-1/2
88-1/2
0
85
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