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Maximum Allowable Exhaust Vent Pipe Length
Winter Design Temperatures
ºF (ºC)
32 to 21
(0 to -6)
20 to 1
(-7 to -17)
0 to -20
(-18 to -29)
Refer to 99% Minimum Design Temperature table provided in the current edition of the ASHRAE Fundamentals Handbook.
1
Poly-Propylene vent pipe (PP) by Duravent and Centrotherm
2
Vent length in table is equivalent length. Each elbow is equivalent to 5ft of straight pipe and should be included when measuring
3
total length.
NOTE - Concentric terminations are the equivalent of 5' and should be considered when measuring pipe length.
NOTE - Maximum uninsulated vent lengths listed may include the termination (vent pipe exterior to the structure ) and cannot exceed
5 linear feet or the maximum allowable intake or exhaust vent length listed in Table 7 or Table 8.
NOTE - If insulation is required an unconditioned space, it must be located on the pipe closed to the furnace.
Page 20 of 53
For Canadian Installations Only
In accordance to CSA International B149 installation
codes, the minimum allowed distance between the
combustion air intake inlet and the exhaust outlet of
other appliances shall not be less than 12 inches (305
mm).
(in ft.) without Insulation in Unconditioned Space for Winter Design
3
Temperatures Single - Stage High Efficiency Furnace
1
Vent Pipe
Diameter
PVC
1-1/2 in.
20
2 in.
18
2-1/2 in.
13
3 in.
9
1-1/2 in.
15
2 in.
9
2-1/2 in.
5
3 in.
N/A
1-1/2 in.
10
2 in.
5
2-1/2 in.
N/A
3 in.
N/A
IMPORTANT
Unit Input Size
045
070
PP
PVC
2
2
N/A
15
N/A
16
31
28
N/A
24
N/A
9
18
18
N/A
15
N/A
8
18
16
N/A
13
N/A
N/A
8
N/A
15
N/A
3
12
10
N/A
7
N/A
N/A
N/A
N/A
Table 9.
Issue 1933
090
PP
PVC
PP
2
N/A
N/A
50
48
42
N/A
35
35
N/A
N/A
32
29
24
N/A
8
19
19
N/A
N/A
22
19
15
N/A
10
10
110
PVC
PP
2
N/A
N/A
30
30
56
N/A
47
47
N/A
N/A
30
30
34
N/A
26
26
N/A
N/A
30
27
22
N/A
16
16
507735-03
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