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N
-D
V
(S
ON
IRECT
ENT
INGLE
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 extend 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.
Although non-direct vent installations do not require a combustion air intake pipe, a minimum of one 90° elbow should be attached to
the furnace's combustion air intake if: an upright installation uses the standard intake location, or a horizontal installation uses the
alternate air intake location. This elbow will guard against inadvertent blockage of the air intake.
V
/F
P
L
ENT
LUE
IPE
ENGTHS AND
NOTE: For installations at or above 7,000 feet altitude, use 3" venting. If either a 90 degree or 45 degree elbow is used for
termination, it must be pointed downward.
Refer to the following table for applicable length, elbows, and pipe diameter for construction of the vent/flue pipe system of a non-
direct vent installation. In addition to the vent/flue pipe, a single 90° elbow should be secured to the combustion air intake to prevent
inadvertent blockage. The tee used in the vent/flue termina-
tion must be included when determining the number of elbows in
the piping system.
1) Maximum allowable limits listed on individual lengths for
inlet and flue and NOT a combination.
2) Minimum requirement for each vent pipe is 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 sys-
tem
4) 2 1/2" or 3" diameter pipe can be used in place of 2"
diameter pipe.
5) Increased Clearance Configurations 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.
NOTE: For installations at or above 7,000 feet altitude, use
3" venting.
V
/F
P
T
ENT
LUE
IPE
ERMINATIONS
NOTE: If either a 90 degree or 45 degree elbow is used for
termination, it must be pointed downward.
The vent/flue pipe may terminate vertically, as through a roof, or horizontally, as through an outside wall.
Vertical vent/flue pipe terminations should be as shown in the following figure. Refer to Vent/Flue Pipe and Combustion Air Pipe -
Termination Locations for details concerning location restrictions. The penetration of the vent through the roof must be sealed tight
with proper flashing such as is used with a plastic plumbing vent.
Horizontal vent/flue pipe terminations should be as shown in the following figure. Refer to Vent/Flue Pipe and Combustion 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 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.
P
) P
IPE
IPING
D
IAMETERS
B
E SURE NOT TO DAMAGE INTERNAL WIRING OR OTHER COMPONENTS
WHEN REINSTALLING COUPLING AND SCREWS
*MVC96/*CVC96 Direct Vent (2 - Pipe) and Non-Direct Vent (1- Pipe)
Maximum Allowable Length of Vent/Flue Pipe
& Combustion Air Pipe (ft)
Pipe Size
MODEL
(4)
(in.)
2
*M VC960403BN
3
2
*M VC960603BN
3
2
*M VC960803BN
3
2
*M VC960804CN
3
2
N/A
*M VC961005CN
3
2
N/A
*M VC961205DN
3
2
*CVC960403BN
3
2
*CVC960603BN
3
2
*CVC960804CN
3
2
N/A
*CVC961005CN
3
2
N/A
*CVC961205DN
3
16
CAUTION
.
(1) (2)
(3) (5)
Number of Elbows
1
2
3
4
5
120
115
110
105
100
95
134
127
120
113
106
99
100
95
90
85
80
75
151
144
137
130
123
116
45
40
35
30
25
20
113
106
99
92
85
78
70
65
60
55
50
45
89
82
75
68
61
54
N/A
N/A
N/A
N/A
N/A
120
113
106
99
92
85
N/A
N/A
N/A
N/A
N/A
151
144
137
130
123
116
120
115
110
105
100
95
185
178
171
164
157
150
85
80
75
70
65
60
168
161
154
147
140
133
40
35
30
25
20
15
120
113
106
99
92
85
N/A
N/A
N/A
N/A
N/A
113
106
99
92
85
78
N/A
N/A
N/A
N/A
N/A
151
144
137
130
123
116
(6)
6
7
8
90
85
92
85
70
65
109
102
15
10
71
64
N/A
N/A
47
40
N/A
N/A
78
71
N/A
N/A
109
102
N/A
N/A
143
136
55
50
126
119
10
5
78
71
N/A
N/A
71
64
N/A
N/A
109
102
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