Bryant 355CAV - Maximum Allowable Pipe Length

41
Table 9 — Maximum Allowable Pipe Length (Ft / M) (Continued)
ALTITUDE
UNIT SIZE
(BTUH)
Direct Vent (2--Pipe Only)
NUMBER OF 90_ ELBOWS
Ter m i n a t i o n
Type
Pipe Dia
(IN.)*
1 2 3 4 5 6
6001 to 7000‡
60,000
2Pipeor2---In.
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
2Pipeor2---In.
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
2Pipeor2---In.
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
2Pipeor3---In.
Concentric
3onedisk† 49 / 14.9 48 / 14.6 47 / 14.3 45 / 13.7 44 / 13.4 43 / 13.1
ALTITUDE
UNIT SIZE
(BTUH)
Ter m i n a t i o n
Type
Pipe Dia
(IN.)*
NUMBER OF 90_ ELBOWS
1 2 3 4 5 6
7001 to 8000‡
60,000
2Pipeor2---In.
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
2Pipeor2---In.
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
2Pipeor2---In.
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
2Pipeor3---In.
Concentric
3onedisk† 46 / 14.0 44 / 13.4 43 / 13.1 41 / 12.5 40 / 12.2 38 / 11.6
ALTITUDE
UNIT SIZE
(BTUH)
Ter m i n a t i o n
Type
Pipe Dia
(IN.)*
NUMBER OF 90_ ELBOWS
1 2 3 4 5 6
8001 to 9000‡
60,000
2Pipeor2---In.
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
2Pipeor2---In.
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
2Pipeor2---In.
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
2Pipeor3---In.
Concentric
3onedisk† 43 / 13.1 41 / 12.5 39 /11.9 37 / 11.3 35 / 10.7 34 / 10.4
ALTITUDE
UNIT SIZE
(BTUH)
Ter m i n a t i o n
Type
Pipe Dia
(IN.)*
NUMBER OF 90_ ELBOWS
1 2 3 4 5 6
9001 to
10000‡
60,000
2Pipeor2---In.
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
2Pipeor2---In.
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
2Pipeor2---In.
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
2Pipeor3---In.
Concentric
3onedisk† 39 / 11.9 37 / 11.3 35 / 10.7 33 / 10.1 31 / 9.5 29 / 8.8
*Diskusage---Unlessotherwisestated,useperforateddiskassembly(factory---suppliedinloosepartsbag).
{ 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; pressur e 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 equa l 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 th e vent termination should not be included in vent length or elbow count.
5. The minimum pipe length is 5 ft for all application s.
355CAV