Carrier 58MXA - Page 15

15
MAXIMUM ALLOWABLE PIPE LENGTH (FT) Continued
* Disk usage—Unless otherwise specified, use perforated disk assembly (factory-supplied in loose parts bag). If 1 disk is stated, separate 2 halves of
perforated disk assembly and use shouldered disk half. When using shouldered disk half, install screen side toward inlet box.
† Wide radius elbow.
‡ Vent sizing for Canadian installations over 4500 ft (1370m) above sea level are subject to acceptance by the local authorities having jurisdiction.
NA — Not Allowed; pressure switch will not make.
NOTES:
1. Do not use pipe size greater than those specified in table or incomplete combustion, flame disturbance, or flame sense lockout may occur.
2. Size both the combustion-air and vent pipe independently, then use the larger diameter for both pipes.
3. Assume two 45° elbows equal one 90° elbow. Long radius elbows are desirable and may be required in some cases.
4. Elbows and pipe sections within the furnace casing and at the vent termination should not be included in vent length or elbow count.
5. The minimum pipe length is 5 ft for all applications.
6. Use 3 in. diameter vent termination kit for installations requiring 4 in. diameter pipe.
ALTITUDE
ABOVE SEA
LEVEL (FT) UNIT SIZE TERMINATION TYPE
PIPE DIA
(IN.)*
NUMBER OF 90° ELBOWS
123456
5001 to 6000‡
040-08
040-12
2 Pipe 2-In. Concentric
1-1/2 57 52 47 42 40 35
2 707070707070
060-08
060-12
060-16
2 Pipe or 2-In. Concentric
1-1/2 14 9 NA NA NA NA
2 605554494847
080-12
080-16
080-20
2 Pipe or 2-In. Concentric
2 4136231817 8
2-1/2 70 70 70 70 70 70
100-16
100-20
2 Pipe or 3-In Concentric
2-1/2 29 21 12 11 NA NA
3 706762575247
120-20 2 Pipe or 3-In. Concentric
3† no disk 42 35 29 22 15 9
4† no disk 70 70 70 70 70 70
140-20
2 Pipe or 3-In.
Concentric
3† no disk 12 8 NA NA NA NA
4† no disk 42 37 32 27 22 17
6001 to 7000‡
040-08
040-12
2 Pipe or 2-In. Concentric
1-1/2 53 48 43 38 37 32
2 707068676664
060-08
060-12
060-16
2 Pipe or 2-In. Concentric
1-1/2 13 8 NA NA NA NA
2 575250454443
080-12
080-16
080-20
2 Pipe or 2-In. Concentric
2 3833211615 6
2-1/2 70 70 68 67 66 64
100-16
100-20
2 Pipe or 3-In. Concentric ‘
2-1/2 27 19 10 9 NA NA
3 686358534843
120-20 2 Pipe or 3-In. Concentric
3† no disk 31 24 18 11 NA NA
4† no disk 70 70 70 70 67 62
140-20 2 Pipe or 3-In. Concentric 4† no disk 17 12 7 NA NA NA
7001 to 8000‡
040-08
040-12
2 Pipe or 2-In. Concentric
1-1/2 49 44 39 34 33 28
2 666563626059
060-08
060-12
060-16
2 Pipe or 2-In. Concentric
1-1/2 12 7 NA NA NA NA
2 534846414038
080-12
080-16
080-20
2 Pipe or 2-In. Concentric
2 3631191412NA
2 1/2 66 65 63 62 60 59
100-16
100-20
2 Pipe or 3-In. Concentric
2-1/2 25 17 8 7 NA NA
3 635853484338
120-20 2 Pipe or 3-In. Concentric
3† no disk 20 13 7 NA NA NA
4† no disk 61 56 51 46 41 36
140-20 NA
8001 to 9000‡
040-08
040-12
2 Pipe or 2-In. Concentric
1-1/2 46 41 36 31 29 24
2 626058565553
060-08
060-12
060-16
2 Pipe or 2-In. Concentric
1-1/2 11 6 NA NA NA NA
2 494442373534
080-12
080-16
080-20
2 Pipe or 2-In. Concentric
2 3328171210NA
2-1/2 62 60 58 56 55 53
100-16
100-20
2 Pipe or 3-In. Concentric
2-1/2 23 15 7 5 NA NA
3 595449443934
120-20 2 Pipe or 3-In. Concentric
3† no disk 10 NA NA NA NA NA
4† no disk 35 30 25 20 15 10
140-20 NA
9001 to
10,000‡
040-08
040-12
2 Pipe or 2-In. Concentric
1-1/2 42 37 32 27 25 20
2 575553514947
060-08
060-12
060-16
2 Pipe or 2-In. Concentric 2 45 40 38 33 31 29
080-12
080-16
080-20
2 Pipe or 2-In. Concentric
2 302514 9 7 NA
2-1/2 57 55 53 51 49 47
100-16
100-20
2 Pipe or 3-In. Concentric
2-1/2 21 13 5 NA NA NA
3 544944393429
120-20 2 Pipe or 3-In. Concentric 4† no disk 10 5 NA NA NA NA
140-20 NA