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Table 6 – Maximum Allowable Exposed Vent Pipe Length (Ft / M) with Insulation in
Winter Design Temperatur e Ambient*
UNIT SIZE
WINTER DESIGN MAXIMUM PIPE
INSULATION THICKNESS†
WINTER
DESIGN
TEMPERATURE
MAXIMUM
PIPE
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 l ength (ft/m) specifiedfor maximum pipe l engthsl ocated in unconditioned spaces. Pipes located in unconditioned space cannot exceed total al lowable
pipe length as sp ecified in Table ?.
†Insulation thickn ess based on R value of 3.5 per in.
355CAV