Installation Manual
17
5 8
2 75 70 65 60 55 50 45 40
3 114 107 100 93 86 79 72 65
2 45 40 35 30 25 20 15 10
3 168 161 154 147 140 133 126 119
2^
35 30 25 20 15 10 5 N/A
3 168 161 154 147 140 133 126 119
2 60 55 50 45 40 35 30 25
3 113 106 99 92 85 78 71 64
2 45 40 35 30 25 20 15 10
3 120 113 106 99 92 85 78 71
2 N/A N/A N/A N/A N/A N/A N/A N/A
3
144 137 130 123 116 109 102 95
2 40 35 30 25 20 15 10 5
3 151 144 137 130 123 116 109 102
2 N/A N/A N/A N/A N/A N/A N/A N/A
3 158 151 144 137 130 123 116 109
2 45 40 35 30 25 20 15 10
3 168 161 154 147 140 133 126 119
2 40 35 30 25 20 15 10 5
3 120 113 106 99 92 85 78 71
2 N/A N/A N/A N/A N/A N/A N/A N/A
3 113 106 99 92 85 78 71 64
2 N/A N/A N/A N/A N/A N/A N/A N/A
3 110 103 96 89 82 75 68 61
^ *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
Number of Elbows
(3) (5)
Maximum Allowable Length of Vent/Flue Pipe (1) (2)
*MES96 / *CES96 Direct Vent (2-Pipe) and Non-Direct Vent (1-Pipe) (6)
1. Maximum allowable limits listed on individual
feet in length and one elbow/tee.
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.
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
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
If either a 90 degree or 45 degree elbow is used for
termination, it must be pointed downward.
or horizontally, as through an outside wall.
Vent/Flue Pipe and Combustion
Air Pipe - Termination Locations for details concerning
location restrictions. The penetration of the vent through
is used with a plastic plumbing vent.
Vent/Flue Pipe and Com-
bustion Air Pipe. To secure the pipe passing through the
wall and prohibit damage to piping connections, a coupling
should be installed on either side of the wall and solvent
cemented to a length of pipe connecting the two couplings.
The length of pipe should be the wall thickness plus the
and outside of the wall. The wall penetration should be
sealed with silicone caulking material.
Vent Pipe
Use alternate vent
& combination
air locations
Combustion Air Pipe
Field Supplied
Drain Tee on Vent Pipe
Condensate trapped
to prevent flue gas from escaping
and routed to field supplied
condensate disposal
1/4” per foot min.
slope to furnace
6’ Max.
Floor
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DOWN VENTING UPFLOW MODEL FURNACES ONLY
All piping and fittings must be joined per material manufacturers specifications
to prevent separation and flue gas leaks.