Product data

16
MAXIMUM ALLOWABLE PIPE LENGTH (FT / M) (CONTINUED)
ALTITUDE
UNIT SIZE
(BTUH)
Direct Vent (2 --Pipe Only)
NUMBER OF 90_ ELBOWS
Termination
Type
Pipe Dia
(IN.)*
1 2 3 4 5 6
6001 to 7000‡
60,000
2 P i p e o r 2 --- I n .
Concentric
1 --- 1 / 2 35 / 10.7 30 / 9.1 25 / 7.6 20 / 6.1 15 / 4.6 10 / 3.0
2 70 / 21.3 70 / 21.3 68 / 20.7 67 / 20.4 66 / 20.11 64 / 19.5
80,000
2 P i p e o r 2 --- I n .
Concentric
1 --- 1 / 2 20 / 6.1 15 / 4.6 10 / 3.0 5/1.5 NA NA
2 70 / 21.3 70 / 21.3 68 / 20.7 67 / 20.4 62 / 18.9 57 / 17.4
100,000
2 P i p e o r 2 --- I n .
Concentric
2 31 / 9.4 26 / 7.9 21 / 6.4 16 / 4.9 11 / 3.4 6/1.8
2 --- 1 / 2 70 / 21.3 70 / 21.3 68 / 20.7 67 / 20.4 66 / 20.1 64 / 19.5
120,000
2 P i p e o r 3 --- I n .
Concentric
3onedisk† 49 / 14.9 48 / 14.6 47 / 14.3 45 / 13.7 44 / 13.4 43 / 13.1
ALTITUDE
UNIT SIZE
(BTUH)
Termination
Type
Pipe Dia
(IN.)*
NUMBER OF 90_ ELBOWS
1 2 3 4 5 6
7001 to 8000‡
60,000
2 P i p e o r 2 --- I n .
Concentric
1 --- 1 / 2 32 / 9.8 27 / 8.2 22 / 6.7 17 / 5.2 12 / 3.7 7/2.1
2 66 /20.1 65 / 19.8 63 / 19.2 62 / 18.9 60 / 18.3 59 / 18.0
80,000
2 P i p e o r 2 --- I n .
Concentric
1 --- 1 / 2 18 / 5.5 13 / 4.0 8/2.4 NA NA NA
2 66 / 20.1 65 / 19.8 63 / 19.2 62 / 18.9 57 / 17.4 52 / 15.8
100,000
2 P i p e o r 2 --- I n .
Concentric
2 29 / 8.8 24 / 7.3 19 / 5.8 14 / 4.3 9/2.7 NA
2 --- 1 / 2 66 / 20.1 65 / 19.8 63 / 19.2 62 / 18.9 60 / 18.3 59 / 18
120,000
2 P i p e o r 3 --- I n .
Concentric
3onedisk† 46 / 14.0 44 / 13.4 43 / 13.1 41 / 12.5 40 / 12.2 38 / 11.6
ALTITUDE
UNIT SIZE
(BTUH)
Termination
Type
Pipe Dia
(IN.)*
NUMBER OF 90_ ELBOWS
1 2 3 4 5 6
8001 to 9000‡
60,000
2 P i p e o r 2 --- I n .
Concentric
1 --- 1 / 2 30 / 9.1 25 / 7.6 20 / 6.1 15 / 4.6 10 / 3.0 5/1.5
2 62 / 18.9 60 / 17.8 58 / 17.7 56 / 17.1 55 / 16.8 53 / 16.2
80,000
2 P i p e o r 2 --- I n .
Concentric
1 --- 1 / 2 17 / 5.2 12 / 3.1 7/2.1 NA NA NA
2 62 / 18.9 60 / 18.3 58 / 17.7 56 / 17.1 51 / 15.5 46 / 14.0
100,000
2 P i p e o r 2 --- I n .
Concentric
2 27 / 8.2 22 / 6.7 17 / 5.2 12 / 3.7 7/2.1 NA
2 --- 1 / 2 62 / 18.9 60 / 18.3 58 / 17.7 56 / 17.1 55 / 16.8 53 / 16.2
120,000
2 P i p e o r 3 --- I n .
Concentric
3onedisk† 43 / 13.1 41 / 12.5 39 /11.9 37 / 11.3 35 / 10.7 34 / 10.4
ALTITUDE
UNIT SIZE
(BTUH)
Termination
Type
Pipe Dia
(IN.)*
NUMBER OF 90_ ELBOWS
1 2 3 4 5 6
9001 to
10000‡
60,000
2 P i p e o r 2 --- I n .
Concentric
1 --- 1 / 2 27 / 8.2 22 / 6.7 17 / 5.2 12 / 3.7 7/2.1 NA
2 57 / 17.4 55 / 16.8 53 / 16.2 51 / 15.5 49 / 14.9 47 / 14.3
80,000
2 P i p e o r 2 --- I n .
Concentric
1 --- 1 / 2 15 / 4.6 10 / 3.0 5/1.5 NA NA NA
2 57 / 17.4 55 / 16.8 53 / 16.2 51 / 15.5 46 / 14.0 41 / 12.5
100,000
2 P i p e o r 2 --- I n .
Concentric
2 24 / 7.3 19 / 5.8 14 / 4.3 9/2.7 NA NA
2 --- 1 / 2 57 / 17.4 55 / 16.8 53 / 16.2 51 / 15.5 49 / 14.9 47 / 14.3
120,000
2 P i p e o r 3 --- I n .
Concentric
3onedisk† 39 / 11.9 37 / 11.3 35 / 10.7 33 / 10.1 31 / 9.5 29 / 8.8
* Disk usage ---Unless otherwise stated, use perforated disk assembly (factory ---supplied in loose parts bag).
{ Wide radius elbow.
} Vent sizing for Canadian installations over 4500 ft (1370m) above sea l evel are subject to acceptance by the local a uthorities 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, determine the smallest diameter allowed by the table for each pipe, then use the larger diameter for both pipes.
3. Assume two 45_ elbows equal on e 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.
MAXIMUM ALLOWABLE EXPOSED VENT PIPE LENGTH (FT / M) WITH INSULATION IN
WINTER DESIGN TEMPERATURE AMBIENT*
UNIT SIZE
WINTER DESIGN MAXIMUM PIPE DI-
INSULATION THICKNESS†
WINTER
DESIGN
TEMPERATURE
MAXIMUM
PIPE
D
I
AMETER (IN.)
0 3/8 1/2 3/4 1
042060
20_F / --- 6 . 7 _C 2 30 / 9.1 55 / 16.8 61 / 18.6 70 / 21.3 70 / 21.3
0_F / --- 1 7 . 8 _C 2 16 / 4.9 33 / 10.1 38 / 11.6 46 / 14.0 53 / 16.2
--- 2 0 _F / --- 2 8 . 9 _C 2 9/2.7 23 / 7.0 26 / 7.9 33 / 10.1 38 / 11.6
042080
060080
20_F / --- 6 . 7 _C 2 37 / 11.2 65 / 19.8 70 / 21.4 70 / 21.3 70 / 21.3
0_F / --- 1 7 . 8 _C 2 20 / 6.1 39 / 11.9 45 / 13.7 55 / 16.8 63 / 19.2
--- 2 0 _F / --- 2 8 . 9 _C 2 11 / 3.4 27 / 8.3 31 / 9.4 39 / 11.9 45 / 13.7
060100
20_F / --- 6 . 7 _C 2 --- 1 / 2 41 / 12.5 70 / 21.3 70 / 21.3 70 / 21.3 70 / 21.3
0_F / --- 1 7 . 8 _C 2 --- 1 / 2 21 / 6.4 42 / 12.8 48 / 14.6 59 / 18.0 68 / 20.7
--- 2 0 _F / --- 2 8 . 9 _C 2 --- 1 / 2 11 / 3.4 28 / 8.5 33 / 10.1 41 / 12.5 49 / 14.9
060120
20_F / --- 6 . 7 _C 3 49 / 14.9 70 / 21.3 70 / 21.3 70 / 21.3 70 / 21.3
0_F / --- 1 7 . 8 _C 3 26 / 7.9 51 / 15.5 58 / 17.7 70 / 21.3 70 /21.3
--- 2 0 _F / --- 2 8 . 9 _C 3 15 / 4.6 35 / 10.7 40 / 12.2 50 / 15.2 59 / 18.0
* Pipe length (ft/m) specified for maximum pipe lengths l ocated in unconditioned spaces. Pipes located in unconditioned space cannot exceed total allowable
pipe length as specified in Table.
†Insulation thickness based on R value of 3.5 per in.
355CAV