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Maximum Allowable E xposed Vent Pipe Length (ft) With Insulation in Winter Design Temperature
Ambient*
UNIT SIZE
WINTER DESIGN
TEMP _F
MAX PIPE DIA (IN.)
INSULATION THICKNESS (IN.){
0 3/8 1/2 3/4 1
060---14
20 2 30 55 61 70 70
0 2 16 33 38 46 53
--- 2 0 2 9 23 26 33 38
080---14
080---20
20 2 37 65 70 70 70
0 2 20 39 45 55 63
--- 2 0 2 11 27 31 39 45
100---20
20 2 --- 1 / 2 41 70 70 70 70
0 2 --- 1 / 2 21 42 48 59 68
--- 2 0 2 --- 1 / 2 11 28 33 41 49
120---20
20 3 49 70 70 70 70
0 3 26 51 58 70 70
--- 2 0 3 15 35 40 50 59
* Pipe length (ft) specified for maximum vent pipe lengths located in unconditioned spaces. Vent pipes located in unconditioned space cannot exceed the total
allowablepipelengthasspecifiedintheMaximumAllowablePipeLengthtable.
{ Insula tion thickness based on R value of 3.5 per in.
58UVB
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