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Number of Elbows
PIPE
MODEL
1
2
SIZE
2
75
70
*M9S960403AN
3
114
107
2
45
40
*M9S960603BN
3
168
161
2
35
30
*M9S960803BN
3
168
161
2
60
55
*M9S960804CN
3
113
106
2
45
40
*M9S960805CN
3
120
113
2
40
35
*M9S961005CN
3
151
144
2
N/A
N/A
*M9S961205DN
3
158
151
2
100
95
*C9S960403BN
3
137
130
2
45
40
*C9S960603BN
3
168
161
2
40
35
*C9S960804CN
3
120
113
2
N/A
N/A
*C9S961005CN
3
113
106
2
N/A
N/A
*C9S961205DN
3
110
103
*M9S960803BN - add 20' of 2" pipe for upflow position
7,000 ft altitude or above use 3" pipe
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
Number of Elbows
PIPE
MODEL
1
2
SIZE
2
75
70
*M9S920403AN
3
114
107
2
55
50
*M9S920603BN
3
127
120
2
30
25
*M9S920803BN
3
72
65
2
30
25
*M9S920804CN
3
72
65
2
40
35
*M9S920805CN
3
72
65
2
60
55
*M9S921004CN
3
168
161
2
30
25
*M9S921005CN
3
113
106
2
N/A
N/A
*M9S921205DN
3
65
58
7,000 ft altitude or above use 3" pipe
*M9S920803BN - add 10' of 2" pipe for up flow position, add 66' of 3" pipe for up flow
position
*M9S920804CN - add 25' of 2" pipe for up flow position, add 58' of 3" pipe for up flow
position
*M9S920805CN - add 15' of 2" pipe fpr upflow position, add 58' of 3" pipe for upflow
position
1) Maxim um allow able lim its listed on individual lengths for inlet and flue and NOT a
com bination
2) Minim um requirem ent for each vent pipe is five (5) feet in length and one elbow /tee
3) Tee used in the vent/flue term ination m ust be included w hen determ ining the num ber
of elbow s 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 if five (5)
feet in length and one elbow/tee.
3
4
5
6
65
60
55
50
100
93
86
79
35
30
25
20
154
147
140
133
25
20
15
10
154
147
140
133
50
45
40
35
99
92
85
78
35
30
25
20
106
99
92
85
30
25
20
15
137
130
123
116
N/A
N/A
N/A
N/A
144
137
130
123
90
85
80
75
123
116
109
102
35
30
25
20
154
147
140
133
30
25
20
15
106
99
92
85
N/A
N/A
N/A
N/A
99
92
85
78
N/A
N/A
N/A
N/A
96
89
82
75
Table 4
3
4
5
6
65
60
55
50
100
93
86
79
45
40
35
30
113
106
99
92
20
15
10
5
58
51
44
37
20
15
10
5
58
51
44
37
30
25
20
15
58
51
44
37
50
45
40
35
154
147
140
133
20
15
10
5
99
92
85
78
N/A
N/A
N/A
N/A
51
44
37
30
Table 5
3. Tee used in the vent/flue termination must be
included when determining the number of elbows in
7
8
the piping system.
45
40
4. 2 ½" or 3" diameter pipe can be used in place of 2"
72
65
diameter pipe.
15
10
5. Increased Clearance Configuration using (2) 45
126
119
5
N/A
deg. Long Sweep elbows should be considered
126
119
equivalent to one 90 deg. elbow.
30
25
6. One 90° elbow should be secured to the combustion
71
64
15
10
air intake connection.
78
71
10
5
109
102
Vent Pipe Connection
N/A
N/A
116
109
The vent pipe outlet is sized to accept 2" pipe. Secure vent
70
65
pipe directly into the furnace fitting with the appropriate
95
88
15
10
glue. Alternately, a small section of 2" pipe may be glued
126
119
in the furnace socket and a rubber coupling installed to
10
5
allow removal for future service. Piping should be routed in
78
71
N/A
N/A
a manner to avoid contact with refrigerant lines, metering
71
64
devices, condensate drain lines, etc. If necessary,
N/A
N/A
clearances may be increased by creating an offset using
68
61
two 45° elbows (Figure 7).
7
8
45
40
72
65
25
20
Increased Clearance Configuration
85
78
N/A
N/A
30
23
N/A
N/A
COMBUSTION AIR PIPE CONNECTION
30
23
10
5
If the furnace is being installed without a combustion air
30
23
30
25
pipe, a 90° elbow should be used on the combustion air
126
119
intake to guard against blockage.
N/A
N/A
71
64
N/A
N/A
On up flow / horizontal models, secure the combustion
23
16
air intake pipe to the air intake coupling using a rubber
coupling supplied with the furnace. The rubber coupling
may be omitted by inverting the intake coupling and gluing
pipe directly to it. Piping may also be glued to the intake
coupling in its original position by using a plastic coupling.
On counterflow units secure the combustion air intake
pipe to the air intake coupling using the rubber coupling
and worm gear hose clamps provided with the unit. The
counterflow rubber coupling allows service removal of air
intake piping internal to the furnace blower compartment.
The combustion air intake pipe can also be secured
directly to the counterflow unit air intake pipe coupling.
15
45 DEGREE
ELBOWS
Figure 7
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