COMBUSTION- -AIR AND VENT PIPING FOR DIRECT VENT/2- -PIPE (ALL SIZES) AND
NON- -DIRECT VENT/1- -PIPE (SIZES 040 THROUGH 120 ONLY) APPLICATIONS (CON'T.)
ALTITUDE
UNIT SIZE
(BTUH)
FT (M)
40,000
60,000
80,000
3001 to 4000
(914 to 1219)
100,000
120,000
ALTITUDE
UNIT SIZE
(BTUH)
FT (M)
40,000
60,000
80,000
4001 to 5000‡
(1219 to 1524)
100,000
120,000
See notes at end of table.
DIRECT VENT (2-PIPE) ONLY
TERMINATION
PIPE DIA
TYPE
IN (mm)*
1-1/2 (38)
2 Pipe or 2-in
Concentric
2 (51)
1-1/2 (38)
2 Pipe or 2-in
Concentric
2 (51)
2 (51)
2 Pipe or 2-in
Concentric
2-1/2 (64)
2-1/2 (64)
2 Pipe or 3-in
Concentric
3 (76)
3 (76)† no disk
2 Pipe or 3-in.
Concentric
NA
4 (102)† no
4† no disk
disk
DIRECT VENT (2-PIPE) ONLY
TERMINATION
PIPE DIA
TYPE
IN. (mm)*
1-1/2 (38)
2 Pipe or 2-in
Concentric
2 (51)
1-1/2 (38)
2 Pipe or 2-in
Concentric
2 (51)
2 (51)
2 Pipe or 2-in
Concentric
2-1/2 (64)
2-1/2 (64)
2 Pipe or 3-in
Concentric
3 (76)
3 (76)†
no disk
2 Pipe or 3-in.
NA
Concentric
4 (102)† no
disk
NON-DIRECT
VENT (1-PIPE)
NUMBER OF 90° ELBOWS
ONLY
PIPE DIA
1
2
IN (mm)*
64
59
1-1/2 (38)
(19.5)
(18.0)
70
70
2 (51)
(21.3)
(21.3)
16
11
1-1/2 (38)
(4.9)
(3.4)
68
63
2 (51)
(20.7)
(19.2)
46
41
2 (51)
(14.0)
(12.5)
70
70
2-1/2 (64)
(21.3)
(21.3)
33
24
2-1/2 (64)
(10.1)
(7.3)
70
70
3 (76)
(21.3)
(21.3)
65
58
NA
(19.8)
(17.7)
59
59
3 (76)†
(18.0)
(18.0)
70
70
4 (102) † no disk
(21.3)
(21.3)
NON-DIRECT
VENT (1-PIPE)
NUMBER OF 90° ELBOWS
ONLY
PIPE DIA
1
2
IN. (mm)*
60
55
1-1/2 (38)
(18.3)
(16.8)
70
70
2 (51)
(21.3)
(21.3)
15
10
1-1/2 (38)
(4.6)
(3.0)
64
59
2 (51)
(19.5)
(18.0)
44
39
2 (51)
(13.4)
(11.9)
70
70
2-1/2 (64)
(21.3)
(21.3)
31
22
2-1/2 (64)
(9.4)
(6.7)
70
70
3 (76)
(21.3)
(21.3)
53
46
NA
(16.2)
(14.0)
56
55
3 (76)†
(17.1)
(16.8)
70
70
4 (102)† no disk
(21.3)
(21.3)
14
3
4
5
6
54
49
48
43
(16.5)
(14.9)
(14.6)
(13.1)
70
70
70
70
(21.3)
(21.3)
(21.3)
(21.3)
6
NA
NA
NA
(1.8)
62
57
57
56
(18.9)
(17.4)
(17.4)
(17.1)
28
23
22
13
(8.5)
(7.0)
(6.7)
(4.0)
70
70
70
70
(21.3)
(21.3)
(21.3)
(21.3)
15
14
5
NA
(4.6)
(4.3)
(1.5)
70
66
61
56
(21.3)
(20.1)
(18.6)
(17.1)
51
44
38
31
(15.5)
(13.4)
(11.6)
(9.4)
58
57
57
56
(17.7)
(17.4)
(17.4)
(17.1)
70
70
70
70
(21.3)
(21.3)
(21.3)
(21.3)
3
4
5
6
50
45
44
39
(15.2)
(13.7)
(13.4)
(11.9)
70
70
70
70
(21.3)
(21.3)
(21.3)
(21.3)
5
NA
NA
NA
(1.5)
58
53
52
52
(17.7)
(16.2)
(15.8)
(15.8)
26
21
20
11
(7.9)
(6.4)
(6.1)
(3.4)
70
70
70
70
(21.3)
(21.3)
(21.3)
(21.3)
13
12
NA
NA
(4.0)
(3.7)
67
62
57
52
(20.4)
(18.9)
(17.4)
(15.8)
40
33
26
20
(12.2)
(10.1)
(7.9)
(6.1)
54
53
52
52
(16.5)
(16.2)
(15.8)
(15.8)
70
70
70
70
(21.3)
(21.3)
(21.3)
(21.3)