Lennox G61MPV Engineering Data page 8

EXHAUST PIPE VENTING TABLE
G61MPV
Vent Pipe Vent Pipe −36B−045 36B 045
Diameter
2 in. 59
2−1/2 in. 65
3 in. 77
4 in. 234
NOTE − Minimum Equivalent Vent Pipe length is 15 feet (4.6 m).
1
Maximum Equivalent Vent Length" permitted is defined as Total Length (linear feet) of vent pipe, plus equivalent length (ft.) of fittings, plus equivalent length (ft.) of termination".
2
110 and 111 models installed in up−flow or down−flow applications must have the supplied 90° street ell installed directly into the unit flue collar. The street ell must be included
in the elbow count.
3
135 models installed in up−flow or down−flow applications must have 3 in. to 2 in. reducing elbow (supplied) installed directly into the flue collar. Reducing ell must be included
in elbow count.
4
90_ elbows must be limited to sweep type elbows.
VENTING NOTES One 90_elbow is equivalent to 5 feet of straight vent pipe.
Two 45_ elbows are equal to one 90_ elbow.
One 45_ elbow is equivalent to 2.5 feet of straight vent pipe.
Wall and roof termination (non−concentric) exhaust pipe must terminate with reducer to improve exhaust velocity away from intake piping.
045, 070 and 071 − 2, 2−1/2, 3 or 4 in. − terminate with 1−1/2 in. pipe
090 and 091 − 2, 2−1/2, 3 or 4 in. − terminate with 2 in. pipe
110 and 111 − 2−1/2, 3 or 4 in. − terminate with 2 in. pipe
135 − 3 or 4 in. − terminate with 2 in. pipe
TERMINATION KITS − EQUIVALENT VENT LENGTHS
Vent
Heat Pipe
Size Size
Diameter Diameter
2 in.
in. in.
4
71M80
69M29
2
2−1/2
−045 045
3
4
2
2−1/2
−070 070
−071
3
4
2
2−1/2
−090 090
−091
3
4
2
2−1/2
−110 110
−111
3
4
3 not allowed
−135 135
4 not allowed
1
Requires field provided 1−1/2 in. outdoor exhaust accelerator.
2
Requires field provided 2 in. outdoor exhaust accelerator.
3
For use only in non−direct vent applications, when snow riser is not required. Requires field provided 2 in. outdoor exhaust accelerator.
4
Outdoor exhause accelerator included in 71M80 kir; for use with −045−070−071 models.
G61MPV / Page 8
(For altitudes of 0−10,000 ft)
1
Maximum Equivalent Vent Length − ft.
G61MPV G61MPV G61MPV
−36B−070 36B 070 −36B−071 36B 071 −36C−090 36C 090
−60C−090
4
59 59
4
65 65
4
78 78
214 214
Concentric
Kits
3 in.
60L46
12 not allowed
15 not allowed
21 not allowed
42 not allowed
12 not allowed
15 not allowed
24 not allowed
42 not allowed
3 3
6 6
6 6
12 12
3 3
6 6
6 6
12 12
15
25
2
G61MPV G61MPV
−60C−091 60C 091 −60C−110 60C 110
4
26 26 not allowed
4
42 42
4
72 72
204 204 179
Vent Pipe Equivalent Length − ft.
Close Couple
Kits
2 in. 3 in.
22G44 44J40
30G28 (WTK) 81J20 (WTK)
1
4 4
1
5 5
1
7 7
1
14 14
1
4 4
1
5 5
1
8 8
1
14 14
not allowed 1
not allowed 2
not allowed 2
not allowed 4
not allowed 1
not allowed 2
not allowed 2
not allowed 4
not allowed 6
not allowed 10
2
G61MPV
−60C−111 60C 111
not allowed
4
32 32
4 4
72 72
4
46 (4501 − 10,000 ft.)
179
Outdoor Exhaust
Wall Ring
Accelerator
Kit
(Diameter X Length)
2 in. 1−1/2 x 12 in.
15F74 − − −
4 4
5 5
7 7
14 14
4 4
5 5
8 8
14 14
2
1 not allowed
2
2 not allowed
2
2 not allowed
2
4 not allowed
2
1 not allowed
3
2 not allowed
3
2 not allowed
3
4 not allowed
3
6 not allowed
3
10 not allowed
3
G61MPV
−60D−135 60D 135
not allowed
not allowed
61 (0−4500 ft.)
160
2 x 12 in.
− − −
not allowed
not allowed
not allowed
not allowed
not allowed
not allowed
not allowed
not allowed
1
2
2
4
1
2
2
4
6
10