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15

58MXB

Maximum Allowable Pipe Length (ft) (Continued)

ALTITUDE (FT)

UNIT SIZE

(BTUH)

DIRECT VENT (2-PIPE) ONLY

NON-DIRECT VENT

(1-PIPE) ONLY

NUMBER OF 90° ELBOWS

TERMINATION

TYPE

PIPE DIA

(IN.)*

PIPE DIA

(IN.)*

12 3 4 5 6

4001 to 5000‡

40,000

2 Pipe or 2-in

Concentric

1-1/2 1-1/2 60 55 50 45 44 39

2 2 70 70 70 70 70 70

60,000

2 Pipe or 2-in

Concentric

1-1/2 1-1/2 15 10 5 NA NA NA

2 2 64 59 58 53 52 52

80,000

2 Pipe or 2-in

Concentric

22443926212011

2-1/2 2-1/2 70 70 70 70 70 70

100,000

2Pipeor3-in

Concentric

2-1/2 2-1/2 3122 13 12 NA NA

3370 70 67 62 57 52

120,000

2 Pipe or 3-in.

Concentric

3†nodiskNA53 46 40 33 26 20

NA 3†56555453 52 52

4† no disk4†nodisk 707070707070

138,000

2 Pipe or 3-in.

Concentric

3†nodiskNA211713 95NA

4† no disk NA 696459544944

ALTITUDE (FT)

UNIT SIZE

(BTUH)

DIRECT VENT (2-PIPE) ONLY

NON-DIRECT VENT

(1-PIPE) ONLY

NUMBER OF 90° ELBOWS

TERMINATION

TYPE

PIPE DIA

(IN.)*

PIPE DIA

(IN.)*

12 3 4 5 6

5001 to 6000‡

40,000

2Pipeor2-in

Concentric

1-1/2 1-1/2 57 52 47 42 40 35

2 2 70 70 70 70 70 70

60,000

2Pipeor2-in

Concentric

1-1/2 1-1/2 14 9 NA NA NA NA

2 2 60 55 54 49 48 47

80,000

2Pipeor2-in

Concentric

22413623 18 17 8

2-1/2 2-1/2 70 70 70 70 70 70

100,000

2Pipeor3-in

Concentric

2-1/2 2-1/2 29 21 12 11 NA NA

3370 67 62 57 52 47

120,000

2 Pipe or 3-in.

Concentric

3†nodiskNA423529 22 15 9

NA 3†53 52 50 49 48 47

4† no disk4†nodisk707070707070

138,000

2 Pipe or 3-in.

Concentric

3†nodiskNA128 NA NA NA NA

4† no diskNA4237 32272217

ALTITUDE (FT)

UNIT SIZE

(BTUH)

DIRECT VENT (2-PIPE) ONLY

NON-DIRECT VENT

(1-PIPE) ONLY

NUMBER OF 90° ELBOWS

TERMINATION

TYPE

PIPE DIA

(IN)*

PIPE DIA

(IN)*

12 3 4 5 6

6001 to 7000‡

40,000

2Pipeor2-in

Concentric

1-1/2 1-1/2 5

3 48 433837 32

2 2 70 70 68 67 66 64

60,000

2Pipeor2-in

Concentric

1-1/2 1-1/2 138NA NA NA NA

2 2 57 52 50 45 44 43

80,000

2 Pipe or 2-in

Concentric

2238 33 21 16 15 6

2-1/2 2-1/2 70 70 68 67 66 64

100,000

2 Pipe or 3-in

Concentric

2-1/2 2-1/2 27 19 10 9 NA NA

3368 63 58 53 48 43

120,000

2Pipeor3-in.

Concentric

3†nodiskNA3124 18 11 NA NA

NA 3†4948 47 45 44 43

4† no disk4†nodisk 707070706762

138,000

2Pipeor3-in.

Concentric

4† no disk NA 17 12 7 NA NA NA

See notesat end of table

Combustion-air and vent piping for Direct Vent/2-Pipe (All

Sizes) and Non-Direct Vent/1-Pipe (Sizes 040 through 120

Only) Applications (continued)

1 2 ... 10 11 12 13 14 15 16 17 18 19 20 21 22

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