Outdoor Termination Kits And Corresponding Equivalencies; Vent Pipe Sizing Worksheet - Lennox G71MPP-36B-070 Installation Instructions Manual

TABLE 5
OUTDOOR TERMINATION KITS AND CORRESPONDING EQUIVALENCIES
Vent Pipe Length Equivalency (feet)
Outdoor Ex- Outdoor Ex-
VENT haust Accel- haust Accel- 1-112"
2" Con- 3" Con- 2" Wall Plate 3" Wall 2" Wall
UNIT PIPE erator erator Concentric
centric Kit centric Kit Kit Plate Kit Ring Kit
MODEL DIA. (Dia. X (Dia. X Kit
(in.) Length) Length)
22G44 44J40
1-1/2" X 12" 2"X 12" 71M80 69M29 60L46 30G28 81J20 15F74
2 4 Not 12 Not Not 4 4* 4
Allowed Allowed Allowed
2-1/2 5 Not 15 Not Not 5 5* 5
Allowed Allowed Allowed
36B-070
3 8 Not 24 Not Not 8 8* 8
Allowed Allowed Allowed
4 14 Not 42 Not Not 14 14" 14
Allowed Allowed Allowed
2 Not 1 Not 3 3 Not 1 1"*
Allowed Allowed Allowed
2-1/2 Not 2 Not 6 6 Not 2 2**
Allowed Allowed Allowed
60C-090
3 Not 2 Not 6 6 Not 2 2**
Allowed Allowed Allowed
4 Not 4 Not 12 12 Not 4 4**
Allowed Allowed Allowed
2-1/2 Not 2 Not 6 6 Not 2 2
Allowed Allowed Allowed
60C-110 3 Not 2 Not 6 6 Not 2 2
Allowed Allowed Allowed
4 Not 4 Not 12 12 Not 4 4
Allowed Allowed Allowed
Not
3 Not 6 Not Not 15 Not 6
Allowed Allowed Allowed Allowed Allowed
60D-135
4 Not 10 Not
Allowed Allowed
*Requires field-provided and installed 1-1/2" exhaust accelerator.
Not
Not 25 Not 10
Allowed Allowed Allowed
**Requires field-provided and installed 2" exhaust accelerator.
Step 1
Step 2
Step 3
Step 4
Step 5
Step 6
Proposed vent pipe size :
Termination kit catalog number :
Vent pipe equivalency value from table 5 :
Total number of 90 ° elbows required (indoors and outdoors)
X 5 = equivalent feet of pipe
Total number of 45 ° elbows required (indoors and outdoors)
X 2.5 = equivalent feet of pipe
Linear feet of straight pipe required :
Add equivalent feet of vent pipe listed in
steps 2 through 5.
Equivalent Feet
TOTAL
If the total is equal to, or less than, the allowable maximum given in table 7, the proposed pipe size is acceptable. If the
total exceeds the maximum allowed vent pipe length, repeat the process above using the next larger diameter pipe until
an acceptable total is achieved.
NOTE - In Direct Vent systems, total the equivalent length of either the exhaust OR intake piping run, depending upon which
will be LONGER. Intake and exhaust pipe diameter must be the same size and must be terminated in the same pressure
zone. Intake and exhaust pipe should be roughly the same length.
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