Payne PG95 - Page 46

46
Table 15 –
Maximum Allowable Exposed Vent Lengths in Unconditioned Space − Ft.
Winter
Design
Temp
°F
Unit Size
26,000* BTUH
0" Insulation 3/8" Insulation 1/2" Insulation
Pipe Dia.
In.
1½ 2 1½ 2 1½ 2
20 20 20 50 45 60 50
0 5 5 25 20 30 25
-20 15 10 20 15
-40 10 5 15 10
Winter
Design
Temp
°F
Unit Size 40,000* BTUH 60,000 BTUH
Uninsulated
3/8in. Insulation 1/2in. Insulation
Uninsulated 3/8in. Insulation 1/2in. Insulation
Pipe Dia.
in.
1 ½ 2 2 ½ 1 ½ 2 2 ½ 1 ½ 2 2 ½ 1 ½ 2 2 ½ 3 1 ½ 2 2 ½ 3 1 ½ 2 2 ½ 3
20 20 20 20 20 50 45 20 60 50 20 30 30 25 20 75 65 60 20 85 75 65
0 10 5 5 20 25 20 20 30 25 15 15 10 10 20 40 30 25 20 45 40 30
20 5 20 15 10 20 20 15 10 5 20 25 20 15 20 30 25 20
40 15 10 5 15 15 10 5 20 15 15 10 20 20 15 10
Winter
Design
Temp
°F
Unit Size 80,000 BTUH
Uninsulated 3/8in. Insulation 1/2in. Insulation
Pipe Dia.
in.
1 ½ 2 2 ½ 3 4 1 ½ 2 2 ½ 3 4 1 ½ 2 2 ½ 3 4
20 15 40 40 35 30 15 50 90 75 65 15 50 70 70 70
0 15 20 15 10 5 15 50 45 35 30 15 50 50 40 35
20 15 10 5 15 35 30 20 15 15 40 30 25 15
40 10 5 15 25 20 15 5 15 30 25 20 10
Winter
Design
Temp
°F
Unit Size 100,000 BTUH
Uninsulated 3/8in. Insulation 1/2in. Insulation
Pipe Dia.
in.
2 2 ½ 3 4 2 2 ½ 3 4 2 2 ½ 3 4
20 20 50 40 35 20 80 95 80 20 80 105 90
0 20 20 15 10 20 55 45 35 20 65 55 45
20 15 10 5 20 35 30 20 20 45 35 25
40 10 5 20 25 20 10 20 30 25 15
Winter
Design
Temp
°F
Unit Size 120,000 BTUH 140,000 BTUH
Uninsulated
3/8in. Insulation 1/2in. Insulation
Uninsulated 3/8in. Insulation 1/2in. Insulation
Pipe Dia.
in.
2 ½ 3 4 2 ½ 3 4 2 ½ 3 4 2 ½ 3 4 2 ½ 3 4 2 ½ 3 4
20 10 50 40 10 75 95 10 75 105 5 55 50 5 65 105 5 65 125
0 10 20 15 10 55 45 10 65 50 5 25 15 5 65 50 5 65 60
-20 10 10 10 35 25 10 45 30 5 10 5 5 45 30 5 50 40
-40 10 5 10 25 15 10 30 20 5 5 5 30 20 5 35 25
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