Lennox EL195UHE Elite Series Installation Instructions Manual page 24

Maximum Allowable Exhaust Vent Pipe Length Without Insulation In Unconditioned Space For
Winter Design Temperatures Single − Stage High Efficiency Furnace
Winter Design
1
Temperatures °F (°C)
32 to 21
(
0 to −6)
20 to 1
(−7 to −17)
0 to −20
(−18 to −29)
1
Refer to 99% Minimum Design Temperature table provided in the current edition of the ASHRAE Fundamentals Handbook.
NOTE − Maximum unisulated vent lengths listed cannot exceed the maximum allowable intake or exhaust vent length listed in table 5.
TABLE 7
Vent Pipe
Diameter
045
2 in. 26
2−1/2 in. 18
3 in. 14
2 in 16
2−1/2 in. 12
3 in. 9
2 in. 10
2−1/2 in. 8
3 in. 4
Page 24
Unit Input Size
070 090
44 44
32 50
26 38
28 40
20 30
16 26
20 30
14 20
10 16
110 135
24 N/A
58 N/A
55 60
24 N/A
44 N/A
32 40
24 N/A
32 N/A
26 30