Payne PG92ESA Installation, Start-Up, Operating And Service And Maintenance Instructions page 51

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