39
Table 6 – Maximum Allowable Exposed Vent Pipe Length (Ft / M) with Insulation in
Winter Design Temperature Ambient*
UNIT SIZE
WINTER DESIGN MAXIMUM PIPE
INSULATION THICKNESS†
TEMPERATURE
DIAMETER (IN.) 0 3/8 1/2 3/4 1
042060
20_F/--6.7_C 2 30 / 9.1 55 / 16.8 61 / 18.6 70 / 21.3 70 / 21.3
0_F / --17.8_C 2 16 / 4.9 33 / 10.1 38 / 11.6 46 / 14.0 53 / 16.2
-- 2 0 _F / --28.9_C 2 9/2.7 23 / 7.0 26 / 7.9 33 / 10.1 38 / 11.6
042080
060080
20_F/--6.7_C 2 37 / 11.2 65 / 19.8 70 / 21.4 70 / 21.3 70 / 21.3
0_F / --17.8_C 2 20 / 6.1 39 / 11.9 45 / 13.7 55 / 16.8 63 / 19.2
-- 2 0 _F / --28.9_C 2 11 / 3.4 27 / 8.3 31 / 9.4 39 / 11.9 45 / 13.7
060100
20_F/--6.7_C 2--1/2 41 / 12.5 70 / 21.3 70 / 21.3 70 / 21.3 70 / 21.3
0_F / --17.8_C 2--1/2 21 / 6.4 42 / 12.8 48 / 14.6 59 / 18.0 68 / 20.7
-- 2 0 _F / --28.9_C 2--1/2 11 / 3.4 28 / 8.5 33 / 10.1 41 / 12.5 49 / 14.9
060120
20_F/--6.7_C 3 49 / 14.9 70 / 21.3 70 / 21.3 70 / 21.3 70 / 21.3
0_F / --17.8_C 3 26 / 7.9 51 / 15.5 58 / 17.7 70 / 21.3 70 /21.3
-- 2 0 _F / --28.9_C 3 15 / 4.6 35 / 10.7 40 / 12.2 50 / 15.2 59 / 18.0
* Pipe length (ft/m) specified for maximum pipe lengths located in uncondition ed spaces. Pipes located in un conditioned space cannot exceed total allowable
pipe length as specified in Table ?.
†Insulation thickness based on R valu e of 3.5 per in.
58MVC
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