Page 29
TABLE 15
Maximum Allowable Exhaust Vent Pipe Length (in ft.) Without Insulation In Unconditioned Space For
Winter Design Temperatures Single - Stage High Eciency Furnace
Winter Design
Temperatures1 °F
(°C)
Vent Pipe
Diameter
Unit Input Size
2
PP
2
PP
2
PP
2
PP
2
PP
2 in 31
13
3 in 9 9
2 in 9 32 29
13
3 in 1 1 19 19
2 in 3 12 22 19
1 22
3 in 2 2
1
2
Conditioned
Space
Unconditioned
Space
Exhaust
Pipe
Intake
Pipe
Conditioned
Space
Pipe Insulation
FIGURE 31
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