Goodman *CSS9* Installation Instructions Manual - page 15
15
N
ON
-D
IRECT
V
ENT
(S
INGLE
P
IPE
) P
IPING
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
ENT
/F
LUE
P
IPE
L
ENGTHS
AND
D
IAMETERS
NOTE: If either a 90 degree or 45 degree elbow is used for
termination, it must be pointed downward.
Refer to the Direct and Non-Direct Vent 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.
V
ENT
/F
LUE
P
IPE
T
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 re-
strictions. The penetration of the vent through the roof must
be sealed tight with proper flashing such as is used with a plas-
tic 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 pro-
hibit damage to piping connections, a coupling should be in-
stalled 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 fit-
tings 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.).
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 system.
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.
*MSS9* / *CSS9 Direct Vent (2-Pipe)
& Non-Direct Vent (1-Pipe)
(6)
Maximum Allowable Length of Vent/FLue Pipe
& Combustion Air Pipe (Ft)
(1) (2)
Model
Pipe
Size
1
2
3
4
5
6
7
8
2"
145
140
135
130
125
120
115
110
3"
238
231
224
217
210
203
196
189
2"
220
215
210
205
200
195
190
185
3"
224
217
210
203
196
189
182
175
2"
95
90
85
80
75
70
65
60
3"
238
231
224
217
210
203
196
189
2"
95
90
85
80
75
70
65
60
3"
238
231
224
217
210
203
196
189
2"
45
40
35
30
25
20
15
10
3"
217
210
203
196
189
182
175
168
2"
45
40
35
30
25
20
15
10
3"
217
210
203
196
189
182
175
168
*MSS9*1205DNA*
3"
238
231
224
217
210
203
196
189
Model
Pipe
Size
1
2
3
4
5
6
7
8
2"
145
140
135
130
125
120
115
110
3"
238
231
224
217
210
203
196
189
2"
120
115
110
105
100
95
90
85
3"
224
217
210
203
196
189
182
175
2"
95
90
85
80
75
70
65
60
3"
238
231
224
217
210
203
196
189
2"
25
20
15
10
5
n/a
n/a
n/a
3"
238
231
224
217
210
203
196
189
*CSS9*1205DNA*
3"
238
231
224
217
210
203
196
189
*MSS9*0805CNA*
*MSS921004CNA*
*MSS921005CNA*
*MSS961005CNA*
*CSS9*0402BNA*
*CSS9*0603BNA*
*CSS9*0804CNA*
*CSS9*1005CNA*
Number of Elbows
(3) (5)
*MSS9*0402BNA*
*MSS9*0603BNA*
*MSS9*0803BNA*
*MSS9*0804CNA*