Goodman xMEC96 Series User Manual page 15

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
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 termination must be included when determining the number of elbows in the
piping system.
Unit Input
(Btu)
30,000
40,000
30,000
40,000
60,000
60,000
80,000
80,000
100,000
100,000
120,000
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.
NOTE: Terminate both pipes in the same pressure zone (same side of roof, no major obstacles between pipes, etc.).
P ) P
IPE IPING
D
IAMETERS
*MEC96 Direct Vent (2 - Pipe) and Non-Direct Vent (1- Pipe)
Maximum Allowable Length of Vent/Flue Pipe
Pipe Size
(4)
(in.) 1
2
100
or 2 1/2
3 168
2
50
or 2 1/2
3 143
2 or 2 1/2 60
3 113
2 or 2 1/2 45
3 103
3 185
Number of Elbows
2 3 4
95 90 85
161 154 147
45 40 35
136 129 122
55 50 45
106 99 92
40 35 30
96 89 82
178 171 164
15
(6)
(3) (5)
5 6 7
80 75 70
140 133 126
30 25 20
115 108 101
40 35 30
85 78 71
25 20 15
75 67 60
157 150 143
8
65
119
15
94
25
64
10
53
136