INSTALLATION INSTRUCTIONS
Gas Furnace: N9MSE
56
440 01 4103 03
Specifications subject to change without notice.
Table 17
Maximum Allowable Exposed Vent Lengths in Unconditioned Space
Maximum Length of Uninsulated and Insulated Vent Pipe-Ft (M)
Furnace
Input
Winter
Design
Temp
°
F (
°
C)
Pipe
Length in
Ft. & M
No Insulation
3/8-in. (9.5 mm) Insulation
1/2-in. (12.7 mm) Insulation
Pipe Diameter
−
in. (mm)
Pipe Diameter
−
in. (mm)
Pipe Diameter
−
in. (mm)
1 1/2
2
2 1/2
3
4
1 1/2
2
2 1/2
3
4
1 1/2
2
2 1/2
3
4
(38) (51) (64) (76) (102) (38)
(51) (64) (76) (102) (38) (51) (64) (76) (102)
40,000
20 (-10)
Ft.
48
42
42
N/A N/A
50
122
111
N/A
N/A
50
144
130
N/A
N/A
M
14.6 12.8 12.8 N/A N/A
15.2 37.2 33.8 N/A
N/A 15.2 43.9 39.6 N/A
N/A
0 (-20)
Ft.
25
19
17
N/A N/A
50
75
66
N/A
N/A
50
90
79
N/A
N/A
M
7.6
5.8
5.2 N/A N/A
15.2 22.9 20.1 N/A
N/A 15.2 27.4 24.1 N/A
N/A
-20 (-30)
Ft.
14
7
5
N/A N/A
50
52
45
N/A
N/A
50
64
55
N/A
N/A
M
4.3
2.1
1.5 N/A N/A
15.2 15.8 13.7 N/A
N/A 15.2 19.5 16.8 N/A
N/A
-40 (-40)
Ft.
7
0
0
N/A N/A
50
38
31
N/A
N/A
50
48
40
N/A
N/A
M
2.1
0.0
0.0 N/A N/A
15.2
11.6
9.4
N/A
N/A 15.2 14.6 12.2 N/A
N/A
60,000
20 (-10)
Ft.
30
61
61
54
N/A
30
135
163
142
N/A
30
135
191
166
N/A
M
9.1
18.6 18.6 16.5 N/A
9.1
41.1 49.7 43.3 N/A
9.1
41.1 58.2 50.6
N/A
0 (-20)
Ft.
30
31
30
23
N/A
30
113
100
85
N/A
30
135
120
101
N/A
M
9.1
9.4
9.1
7.0
N/A
9.1
34.4 30.5 25.9 N/A
9.1
41.1 36.6 30.8
N/A
-20 (-30)
Ft.
24
17
15
7
N/A
30
81
70
57
N/A
30
98
85
70
N/A
M
7.3
5.2
4.6
2.1
N/A
9.1
24.7 21.3 17.4 N/A
9.1
29.9 25.9 21.3
N/A
-40 (-40)
Ft.
15
8
5
0
N/A
30
61
52
40
N/A
30
75
64
51
N/A
M
4.6
2.4
1.5
0.0
N/A
9.1
18.6 15.8 12.2 N/A
9.1
22.9 19.5 15.5
N/A
80,000
20 (-10)
Ft.
20
70
78
70
60
20
70
175
183
154
20
70
175
215
181
M
6.1
21.3 23.8 21.3 18.3
6.1
21.3 53.3 55.8 46.9
6.1
21.3 53.3 65.5 55.2
0 (-20)
Ft.
20
42
41
33
21
20
70
132
111
89
20
70
157
133
107
M
6.1
12.8 12.5 10.1 6.4
6.1
21.3 40.2 33.8 27.1
6.1
21.3 47.9 40.5 32.6
-20 (-30)
Ft.
20
25
23
14
1
20
70
94
77
57
20
70
113
94
71
M
6.1
7.6
7.0
4.3
0.3
6.1
21.3 28.7 23.5 17.4
6.1
21.3 34.4 28.7 21.6
-40 (-40)
Ft.
20
14
12
3
0
20
70
71
56
38
20
70
86
70
50
M
6.1
4.3
3.7
0.9
0.0
6.1
21.3 21.6 17.1 11.6
6.1
21.3 26.2 21.3 15.2
100,000
20 (-10)
Ft.
N/A
25
99
89
78
N/A
25
110
233
265
N/A
25
110
235
229
M
N/A
7.6 30.2 27.1 23.8
N/A
7.6 33.5 71.0 80.8 N/A
7.6 33.5 71.6 69.8
0 (-20)
Ft.
N/A
25
55
46
33
N/A
25
110
145
117
N/A
25
110
173
140
M
N/A
7.6 16.8 14.0 10.1
N/A
7.6 33.5 44.2 35.7 N/A
7.6 33.5 52.7 42.7
-20 (-30)
Ft.
N/A
25
34
24
11
N/A
25
110
103
79
N/A
25
110
124
97
M
N/A
7.6 10.4 7.3
3.4
N/A
7.6 33.5 31.4 24.1 N/A
7.6 33.5 37.8 29.6
-40 (-40)
Ft.
N/A
23
20
11
0
N/A
25
95
77
55
N/A
25
110
94
70
M
N/A
7.0
6.1
3.4
0.0
N/A
7.6 29.0 23.5 16.8 N/A
7.6 33.5 28.7 21.3
120,000
20 (-10)
Ft.
N/A
N/A
15
99
86
N/A
N/A
15
100
219
N/A
N/A
15
100
250
M
N/A
N/A
4.6 30.2 26.2
N/A
N/A
4.6 30.5 66.8 N/A
N/A
4.6
30.5 76.2
0 (-20)
Ft.
N/A
N/A
15
51
38
N/A
N/A
15
100
130
N/A
N/A
15
100
156
M
N/A
N/A
4.6 15.5 11.6
N/A
N/A
4.6 30.5 39.6 N/A
N/A
4.6
30.5 47.5
-20 (-30)
Ft.
N/A
N/A
15
28
14
N/A
N/A
15
100
88
N/A
N/A
15
100
108
M
N/A
N/A
4.6
8.5
4.3
N/A
N/A
4.6 30.5 26.8 N/A
N/A
4.6
30.5 32.9
-40 (-40)
Ft.
N/A
N/A
15
14
0
N/A
N/A
15
85
62
N/A
N/A
15
100
79
M
N/A
N/A
4.6
4.3
0.0
N/A
N/A
4.6 25.9 18.9 N/A
N/A
4.6
30.5 24.1
140,000
20 (-10)
Ft.
N/A
N/A
10
90
99
N/A
N/A
10
90
210
N/A
N/A
10
90
210
M
N/A
N/A
3.0 27.4 30.2
N/A
N/A
3.0 27.4 64.0 N/A
N/A
3.0
27.4 64.0
0 (-20)
Ft.
N/A
N/A
10
61
47
N/A
N/A
10
90
153
N/A
N/A
10
90
183
M
N/A
N/A
3.0 18.6 14.3
N/A
N/A
3.0 27.4 46.6 N/A
N/A
3.0
27.4 55.8
-20 (-30)
Ft.
N/A
N/A
10
35
21
N/A
N/A
10
90
104
N/A
N/A
10
90
128
M
N/A
N/A
3.0 10.7 6.4
N/A
N/A
3.0 27.4 31.7 N/A
N/A
3.0
27.4 39.0
-40 (-40)
Ft.
N/A
N/A
10
20
NA
N/A
N/A
10
90
75
N/A
N/A
10
90
94
M
N/A
N/A
3.0
6.1
NA
N/A
N/A
3.0 27.4 22.9 N/A
N/A
3.0
27.4 28.7
Copyright 2013 International Comfort Products
Lewisburg, TN 37091 USA
