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912SD: Installation, Start-up, Operating and Service and Maintenance Instructions
HORIZONTAL RIGHT-RIGHT VENT CONFIGURATION
Fig. 57 – Horizontal Right (Appearance may vary)
See "Notes for Venting Options"
Table 15 – Maximum Allowable Exposed Vent Lengths in Unconditioned Space Table - Ft.
Unit Size
Uninsulated
Winter
Design
Pipe Dia. in.
1 ½
Temp
20
20
°F
0
10
-20
5
-40
Unit Size
Winter
Pipe Dia. in.
1 ½
Design
20
15
Temp
0
15
°F
-20
15
-40
10
Unit Size
Winter
Pipe Dia. in.
2
Design
20
20
Temp
0
20
°F
-20
15
-40
10
Unit Size
Uninsulated
Winter
Pipe Dia. in.
2 ½
Design
20
10
Temp
0
10
°F
-20
10
-40
10
Unit Size
Uninsulated
Winter
Pipe Dia.
Design
38
51
mm
Temp
-7
6.1
6.1
°C
-18
3.0
1.5
-29
1.5
-40
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
ALTERNATE
COMBUSTION
AIR CONNECTIONS
40,000* BTUH
3/8-in.
Insulation
2
2 ½
1 ½
2
2 ½
1 ½
20
20
20
50
45
20
5
5
20
25
20
20
20
15
10
20
15
10
5
15
Uninsulated
2
2 ½
3
4
40
40
35
30
20
15
10
5
10
5
5
Uninsulated
2 ½
3
4
50
40
35
20
15
10
10
5
5
120,000 BTUH
3/8-in. Insulation
3
4
2 ½
3
4
50
40
10
75
95
20
15
10
55
45
10
10
35
25
5
10
25
15
Maximum Allowable Exposed Vent Length in Unconditioned Space (Metric)
40,000* BTUH
3/8-in.
1/2-in.
Insulation
Insulation
64
38
51
64
38
6.1
6.1
15.2 13.7 6.1 18.3 15.2
1.5
6.1
7.6
6.1
6.1
6.1
4.6
3.0
6.1
4.6
3.0
1.5
4.6
NOTES FOR VENTING OPTIONS
1. Attach vent pipe adapter with gasket to furnace casing.
2. Align notches in rubber coupling over standoffs on adapter. Slide
clamps over the coupling.
3. Slide vent pipe through adapter and coupling into vent elbow.
4. Insert vent pipe into vent elbow.
5. Torque all clamps 15 lb.-in.
6. Attach combustion air pipe adapter with gasket to furnace.
7. Attach combustion air pipe to adapter with silicone. Pilot drill
a1/8-in. hole in adapter and secure with a #7 x 1/2-in. sheet metal
screw.
A11335
1/2-in.
Uninsulated
Insulation
2
2 ½
1 ½
2
2 ½
60
50
20
30
30
30
25
15
15
10
20
15
10
5
15
10
5
80,000 BTUH
3/8-in. Insulation
1 ½
2
2 ½
3
15
50
90
75
15
50
45
35
15
35
30
20
15
25
20
15
100,000 BTUH
3/8-in. Insulation
2
2 ½
3
20
80
95
20
55
45
20
35
30
20
25
20
1/2-in. Insulation
Uninsulated
2 ½
3
4
2 ½
10
75
105
5
10
65
50
5
10
45
30
5
10
30
20
5
Uninsulated
51
64
38
51
64
6.1
9.1
9.1
9.1
7.6
4.6
4.6
3.0
6.1
4.6
3.0
1.5
4.6
3.0
1.5
43
60,000 BTUH
3/8-in. Insulation
3
1 ½
2
2 ½
3
25
20
75
65
60
10
20
40
30
25
20
25
20
15
20
15
15
10
1/2-in. Insulation
4
1 ½
2
65
15
50
30
15
50
15
15
40
5
15
30
1/2-in. Insulation
4
2
2 ½
80
20
80
35
20
65
20
20
45
10
20
30
140,000 BTUH
3/8-in. Insulation
3
4
2 ½
3
4
55
50
5
65
105
25
15
5
65
50
10
5
5
45
30
5
5
30
20
60,000 BTUH
3/8-in. Insulation
76
38
51
64
76
7.6
6.1
22.9 19.8 18.3 6.1 25.9 22.9 19.8
3.0
6.1
12.2
9.1
7.6
6.1
7.6
6.1
4.6
6.1
4.6
4.6
3.0
1/2-in. Insulation
1 ½
2
2 ½
3
20
85
75
65
20
45
40
30
20
30
25
20
20
20
15
10
2 ½
3
4
70
70
70
50
40
35
30
25
15
25
20
10
3
4
105
90
55
45
35
25
25
15
1/2-in. Insulation
2 ½
3
4
5
65
125
5
65
60
5
50
40
5
35
25
1/2-in. Insulation
38
51
64
76
6.1 13.7 12.2 9.1
6.1
9.1
7.6
6.1
6.1
6.1
4.6
3.0
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