Lennox ML196DF045XE36B User Manual

Page 28
TABLE 14
Maximum Allowable Exhaust Vent Pipe Length
3
Without Insulation In Unconditioned Space For
Winter Design Temperatures Single - Stage High Efficiency Furnace
Winter Design
Temperatures
1
°F (°C)
Vent Pipe
Diameter
Unit Input Size
045 070 090 110
32 to 21
(0 to -6)
PVC
2
PP PVC
2
PP PVC
2
PP PVC
2
PP
1-1/2 in. 20 N/A 20 N/A N/A N/A NAA N/A
2 in. 18 16 31 28 50 48 30 30
2-1/2 in. 13 N/A 24 N/A 42 N/A 36 N/A
3 in. 9 9 18 18 35 35 29 29
20 to 1
(-7 to -17)
1-1/2 in. 15 N/A 20 N/A N/A N/A N/A N/A
2 in 9 8 18 16 32 29 27 24
2-1/2 in. 5 N/A 13 N/A 24 N/A 20 N/A
3 in. N/A N/A 8 8 19 19 14 14
0 to -20
(-18 to -29)
1-1/2 in. 10 N/A 15 N/A N/A N/A N/A N/A
2 in. 5 N/A 12 10 22 19 18 15
2-1/2 in. N/A N/A 7 N/A 15 N/A 12 N/A
3 in. N/A N/A N/A N/A 10 10 7 7
1
Refer to 99% Minimum Design Temperature table provided in the current edition of the ASHRAE Fundamentals Handbook.
2
Poly-Propylene vent pipe (PP) by Duravent and Centrotherm.
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 12 or 13 which ever is less.
NOTE - If insulation is required in an unconditioned space, it must be located on the pipe closest to the furnace. See figure29.
3
Vent length in the table is equivalent length. Each elbow is equivalent to 5ft of straight pipe length and should be included in measuring total pipe length

Lennox ML196DF045XE36B Specifications

General

Brand	Lennox
Model	ML196DF045XE36B
Category	Furnace
Language	English