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*MES96 / *CES96 Direct Vent
Maximum Allowable Length of Vent/Flue Pipe
PIPE
MODEL
1
SIZE
(4)
2
75
*MES960403AN
3
114
2
45
*MES960603BN
3
168
2^
35
*MES960803BN
3
168
2
60
*MES960804CN
3
113
2
45
*MES960805CN
3
120
2
N/A
*MES961004CN
3
144
2
40
*MES961005CN
3
151
2
N/A
*MES961205DN
3
158
2
45
*CES960603BN
3
168
2
40
*CES960804CN
3
120
2
N/A
*CES961005CN
3
113
2
N/A
*CES961205DN
3
110
^ *MES960803BN - add 20' of 2" pipe for upflow position
7,000 ft altitude or above use 3" pipe
^ *MES960402BN - add 25' of 2" pipe for upflow position
^ *MES960803BN - add 20' of 2" pipe for upflow position
1. Maximum allowable limits listed on individual
lengths for inlet and flue and NOT a combination.
2. Minimum requirement for each vent pipe if five (5)
feet in length and one elbow/tee.
3. Tee used in the vent/flue termination must be
included when determining the number of elbows
in the piping system.
4. 2 ½" or 3" diameter pipe can be used in place of 2"
diameter pipe.
5. Increased Clearance Configuration using (2) 45 deg.
Long Sweep elbows should be considered equivalent
to one 90 deg. elbow.
6. One 90° elbow should be secured to the combustion
air intake connection.
Non-Direct Vent (Single Pipe) Piping
Non-direct vent installations require only a vent/flue pipe.
The vent pipe can be run horizontally with an exit through
the side of the building or run vertically with an exit
through the roof of the building. The vent can also be run
through an existing unused chimney; however, it must ex-
tend a minimum of 12 inches above the top of the chimney.
The space between the vent pipe and the chimney must be
closed with a weather-tight, corrosion-resistant flashing.
and Non-Direct Vent
(2-Pipe)
(1-Pipe) (6)
(1) (2)
Number of Elbows
(3) (5)
2
3
4
5
6
70
65
60
55
50
107
100
93
86
79
40
35
30
25
20
161
154
147
140
133
126
30
25
20
15
10
161
154
147
140
133
126
55
50
45
40
35
106
99
92
85
78
40
35
30
25
20
113
106
99
92
85
N/A
N/A
N/A
N/A
N/A
N/A
137
130
123
116
109
102
35
30
25
20
15
144
137
130
123
116
109
N/A
N/A
N/A
N/A
N/A
N/A
151
144
137
130
123
116
40
35
30
25
20
161
154
147
140
133
126
35
30
25
20
15
113
106
99
92
85
N/A
N/A
N/A
N/A
N/A
N/A
106
99
92
85
78
N/A
N/A
N/A
N/A
N/A
N/A
103
96
89
82
75
Vent/Flue Pipe Terminations
NOTE: If either a 90 degree or 45 degree elbow is used for
7
8
termination, it must be pointed downward.
45
40
The vent/flue pipe may terminate vertically, as through a roof,
72
65
15
10
or horizontally, as through an outside wall.
119
5
N/A
Vertical vent/flue pipe terminations should be as shown in the
119
following figure. Refer to Vent/Flue Pipe and Combustion
30
25
71
64
Air Pipe - Termination Locations for details concerning
15
10
78
71
location restrictions. The penetration of the vent through
N/A
the roof must be sealed tight with proper flashing such as
95
10
5
is used with a plastic plumbing vent.
102
N/A
Horizontal vent/flue pipe terminations should be as shown
109
in the following figure. Refer to Vent/Flue Pipe and Com-
15
10
bustion Air Pipe. To secure the pipe passing through the
119
10
5
wall and prohibit damage to piping connections, a coupling
78
71
should be installed on either side of the wall and solvent
N/A
cemented to a length of pipe connecting the two couplings.
71
64
The length of pipe should be the wall thickness plus the
N/A
68
61
depth of the socket fittings to be installed on the inside
and outside of the wall. The wall penetration should be
sealed with silicone caulking material.
NOTE: Terminate both pipes in the same pressure zone
(same side of roof, no major obstacles between pipes,
etc.).
DOWN VENTING UPFLOW MODEL FURNACES ONLY
Combustion Air Pipe
Field Supplied
Drain Tee on Vent Pipe
All piping and fittings must be joined per material manufacturers specifications
17
Use alternate vent
& combination
air locations
Vent Pipe
Floor
1/4" per foot min.
slope to furnace
Condensate trapped
to prevent flue gas from escaping
and routed to field supplied
condensate disposal
to prevent separation and flue gas leaks.
Figure 11
6' Max.
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