Bryant Series B 345MAV - Manual (Page 25)

TABLE 4—MAXIMUM ALLOWABLE VENT PIPE LENGTH (FT)
ALTITUDE (FT) UNIT SIZE
VENT PIPE
DIAMETER (IN.)
NUMBER OF 90° ELBOWS
1 2 3 4 5 6
0 to 2000
024040
036040
1 5 NA NA NA NA NA
1-1/2 70 70 65 60 60 55
2 70 70 70 70 70 70
024060
036060
048060 1-1/2 20 15 10 5 NA NA
2 70 70 70 70 70 70
036080
048080
060080 1-1/2 10 NA NA NA NA NA
2 55 50 35 30 30 20
2-1/2 70 70 70 70 70 70
048100
060100
2 5 NA NA NA NA NA
2-1/2 40 30 20 20 10 NA
3 70 70 70 70 70 70
060120
2-1/2 10 NA NA NA NA NA
3* 70 70 70 70 70 70
ALTITUDE (FT) UNIT SIZE
VENT PIPE
DIAMETER (IN.)
NUMBER OF 90° ELBOWS
1 2 3 4 5 6
2001 to 3000
024040
036040 1-1/2 67 62 57 52 52 47
2 70 70 70 70 70 70
024060
036060
048060 1-1/2 17 12 7 NA NA NA
2 70 67 66 61 61 61
036080
048080
060080 2 49 44 30 25 25 15
2-1/2 70 70 70 70 70 70
048100
060100 2-1/2 35 26 16 16 6 NA
3 70 70 70 70 66 61
060120 3* 63 62 62 61 61 61
ALTITUDE (FT) UNIT SIZE
VENT PIPE
DIAMETER (IN.)
NUMBER OF 90° ELBOWS
1 2 3 4 5 6
3001 to 4000
024040
036040 1-1/2 64 59 54 49 48 43
2 70 70 70 70 70 70
024060
036060
048060 1-1/2 16 11 6 NA NA NA
2 68 63 62 57 57 56
036080
048080
060080 2 46 41 28 23 22 13
2-1/2 70 70 70 70 70 70
048100
060100 2-1/2 33 24 15 14 5 NA
3 70 70 70 66 61 56
060120 3* 59 59 58 57 57 56
ALTITUDE (FT) UNIT SIZE
VENT PIPE
DIAMETER (IN.)
NUMBER OF 90° ELBOWS
1 2 3 4 5 6
4001 to 5000†
024040
036040 1-1/2 60 55 50 45 44 39
2 70 70 70 70 70 70
024060
036060
048060 1-1/2 15 10 5 NA NA NA
2 64 59 58 53 52 52
036080
048080
060080 2 44 39 26 21 20 11
2-1/2 70 70 70 70 70 70
048100
060100 2-1/2 31 22 13 12 NA NA
3 70 70 67 62 57 52
060120 3* 56 55 54 53 52 52
* Wide radius elbow.
† Vent sizing for Canadian installations over 4500 ft (1370 m) 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. Assume two 45° elbows equal one 90° elbow. Long radius elbows are desirable and may be required in some cases.
3. Elbows and pipe sections within the furnace casing and at the vent termination should not be included in vent length or elbow count.
4. The minimum pipe length is 5 ft for all applications.
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