Maximum Allowable Exposed Vent Lengths Insulation - Payne C Series Installation, Start-Up, Operating And Service And Maintenance Instructions

Table 16 – Maximum Allowable Exposed Vent Lengths Insulation Table − Ft. / M
Unit Size
Uninsulated
Pipe Dia.
Winter
1 ½ 2
in.
Design
Temp
20 20 20
°F
0 10 5
­20 5
­40
Unit Size
Pipe Dia.
Winter
1 ½ 2
in.
Design
Temp 20 15 40
°F
0 15 20
­20 15 10
­40 10 5
Unit Size
Pipe Dia.
Winter
2
in.
Design
Temp
20 20
°F
0 20
­20 15
­40 10
Unit Size
Uninsulated
Pipe Dia.
Winter
2 ½ 3
in.
Design
Temp 20 10 50
°F
0 10 20
-20 10 10
-40 10 5
Maximum Allowable Exposed Vent Length in Unconditioned Space (Metric)
Unit Size
Uninsulated
Pipe Dia.
Winter
38 51
mm
Design
Temp
-7 6.1 6.1
°C
-18 3.0 1.5
-29 1.5
-40
Unit Size
Pipe Dia.
Winter
38 51
mm
Design
Temp -7 4.6 12.2
°C
-18 4.6 6.1
-29 4.6 3.0
-40 3.0 1.5
Unit Size
Pipe Dia.
Winter
51
mm
Design
Temp
-7 6.1
°C
-18 6.1
-29 4.6
-40 3.0
Unit Size
Uninsulated
Pipe Dia.
Winter
64 76
mm
Design
Temp
-7 3.0 15.2
°C
-18 3.0 6.1
-29 3.0 3.0
­40 3.0 1.5
Maximum Allowable Exposed Vent Length in Unconditioned Space
40,000* BTUH
3/8­in. Insulation 1/2­in. Insulation
2 ½ 1 ½ 2 2 ½ 1 ½ 2
20 20 50 45 20 60
5 20 25 20 20 30
20 15 10 20 20
15 10 5 15 15
Uninsulated
2 ½ 3 4
40 35 30
15 10 5
5
Uninsulated
2 ½ 3 4 2
50 40 35 20
20 15 10 20
10 5 20
5 20
120,000 BTUH
3/8­in. Insulation 1/2­in. Insulation
4 2 ½ 3 4 2 ½
40 10 75 95 10
15 10 55 45 10
10 35 25 10
10 25 15 10
40,000* BTUH
3/8­in. Insulation 1/2­in. Insulation
64 38 51 64 38 51
6.1 6.1 15.2 13.7 6.1 18.3 15.2
1.5 6.1 7.6 6.1 6.1 9.1
6.1 4.6 3.0 6.1 6.1
4.6 3.0 1.5 4.6 4.6
Uninsulated
64 76 102
12.2 10.7 9.1
4.6 3.0 1.5
1.5
Uninsulated
64 76 102 51
15.2 12.2 10.7 6.1
6.1 4.6 3.0 6.1
3.0 1.5 6.1
1.5 6.1
120,000 BTUH
3/8­in. Insulation 1/2­in. Insulation
102 64 76 102 64
12.2 3.0 22.9 28.9 3.0
4.6 3.0 16.8 13.7 3.0
3.0 10.7 7.6 3.0
3.0 7.6 4.6 3.0
Uninsulated
2 ½ 1 ½ 2 2 ½ 3
50 20 30 30 25
25 15 15 10 10
15 10 5
10 5
80,000 BTUH
3/8­in. Insulation
1 ½ 2 2 ½ 3
15 50 90 75
15 50 45 35
15 35 30 20
15 25 20 15
100,000 BTUH
3/8­in. Insulation
2 ½ 3 4
80 95 80
55 45 35
35 30 20
25 20 10
Uninsulated
3 4 2 ½ 3
75 105 5 55
65 50 5 25
45 30 5 10
30 20 5 5
Uninsulated
64 38 51 64 76
6.1 9.1 9.1 7.6
7.6 4.6 4.6 3.0 3.0
4.6 3.0 1.5
3.0 1.5
80,000 BTUH
3/8­in. Insulation
38 51 64 76
4.6 15.2 27.4 22.9
4.6 15.2 13.7 10.7
4.6 10.7 9.1 6.1
4.6 7.6 6.1 4.6
100,000 BTUH
3/8­in. Insulation
64 76 102
24.4 28.9 24.4
16.8 13.7 10.7
10.7 9.1 6.1
7.6 6.1 3.0
Uninsulated
76 102 64 76 102
22.9 32.0 1.5 16.7 15.2
19.8 15.2 1.5 7.6 4.6
13.7 9.1 1.5 3.0 1.5
9.1 6.1 1.5 1.5
49
60,000 BTUH
3/8­in. Insulation 1/2­in. Insulation
1 ½ 2 2 ½ 3 1 ½ 2
20 75 65 60 20 85
20 40 30 25 20 45
20 25 20 15 20 30
20 15 15 10 20 20
1/2­in. Insulation
4 1 ½ 2 2 ½
65 15 50 70
30 15 50 50
15 15 40 30
5 15 30 25
1/2­in. Insulation
2 2 ½ 3
20 80 105
20 65 55
20 45 35
20 30 25
140,000 BTUH
3/8­in. Insulation 1/2­in. Insulation
4 2 ½ 3 4 2 ½
50 5 65 105 5
15 5 65 50 5
5 5 45 30 5
5 30 20 5
60,000 BTUH
3/8­in. Insulation 1/2­in. Insulation
38 51 64 76 38 51
6.1 22.9 19.8 18.3 6.1 25.9 22.9 19.8
6.1 12.2 9.1 7.6 6.1 13.7 12.2
6.1 7.6 6.1 4.6 6.1 9.1
6.1 4.6 4.6 3.0 6.1 6.1
1/2­in. Insulation
102 38 51 64
19.8 4.6 15.2 21.3
9.1 4.6 15.2 15.2
4.6 4.6 12.2 9.1
1.5 4.6 9.1 7.6
1/2­in. Insulation
51 64 76
6.1 24.4 32.0
6.1 19.8 16.7
6.1 13.7 10.7
6.1 9.1 7.6
140,000 BTUH
3/8­in. Insulation 1/2­in. Insulation
64 76 102 64
1.5 19.8 32.0 1.5
1.5 19.8 15.2 1.5
1.5 13.7 9.1 1.5
1.5 9.1 6.1 1.5
2 ½ 3
75 65
40 30
25 20
15 10
3 4
70 70
40 35
25 15
20 10
4
90
45
25
15
3 4
65 125
65 60
50 40
35 25
64 76
9.1
7.6 6.1
4.6 3.0
76 102
21.3 21.3
12.2 10.7
7.6 4.6
6.1 3.0
102
27.4
13.7
7.6
4.6
76 102
19.8 38.1
19.8 18.3
15.2 12.2
35 7.6