Specifications

12/03/2013 Page 33 of 40
GF-2050
Benchmark Series Boilers
Venting and Combustion Application Guide
TAG-0022_0S
AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 • Ph: 800-526-0288
Table 2e:
Ducted Combustion Air Duct Pressure Drop for BMK 2500 Boiler
Outside Air Temperature (°F)
Inlet Duct
& No.
Boilers
Duct Section
Type
-30 °F -15 °F 0 °F 20 °F 40 °F 60 °F 80 °F 100 °F 120 °F
8" Duct
Single
Boiler
Straight Run
0.40
0.41
0.42
0.43
0.44
0.46
0.47
0.49
0.50
90° Elbow
2.13
2.24
2.35
2.51
2.67
2.85
3.04
3.25
3.47
45° Elbow
1.61
1.69
1.77
1.89
2.02
2.15
2.29
2.45
2.61
Ent. Loss
4.12
4.32
4.54
4.84
5.16
5.51
5.88
6.27
6.69
10" Duct
Single
Boiler
Straight Run
0.13
0.13
0.14
0.14
0.15
0.15
0.16
0.16
0.17
90° Elbow
0.76
0.80
0.84
0.89
0.95
1.01
1.08
1.15
1.23
45° Elbow
0.58
0.61
0.64
0.68
0.73
0.78
0.83
0.88
0.94
Ent. Loss
1.69
1.77
1.86
1.98
2.11
2.26
2.41
2.57
2.74
12" Duct
Two Boilers
Straight Run
0.16
0.17
0.18
0.19
0.21
0.22
0.23
0.25
0.26
90° Elbow
1.32
1.39
1.46
1.56
1.66
1.77
1.89
2.02
2.15
45° Elbow
1.02
1.08
1.13
1.20
1.28
1.37
1.46
1.56
1.66
Ent. Loss
3.26
3.42
3.58
3.82
4.08
4.35
4.64
4.95
5.29
14" Duct
Two Boilers
Straight Run
0.08
0.08
0.08
0.09
0.10
0.10
0.11
0.12
0.12
90° Elbow
0.66
0.70
0.73
0.78
0.83
0.89
0.95
1.01
1.08
45° Elbow
0.52
0.54
0.57
0.61
0.65
0.69
0.74
0.79
0.84
Ent. Loss
1.76
1.84
1.93
2.06
2.20
2.35
2.51
2.67
2.85
16" Duct
Three
Boilers
Straight Run
0.08
0.09
0.09
0.10
0.10
0.11
0.12
0.13
0.13
90° Elbow
0.82
0.86
0.91
0.97
1.03
1.10
1.18
1.25
1.34
45° Elbow
0.64
0.67
0.71
0.76
0.81
0.86
0.92
0.98
1.04
Ent. Loss
2.32
2.43
2.55
2.72
2.90
3.10
3.31
3.53
3.76
18" Duct
Three
Boilers
Straight Run
0.05
0.05
0.05
0.05
0.06
0.06
0.07
0.07
0.08
90° Elbow
0.49
0.51
0.54
0.57
0.61
0.65
0.70
0.74
0.79
45° Elbow
0.38
0.40
0.42
0.45
0.48
0.51
0.54
0.58
0.62
Ent. Loss
1.45
1.52
1.59
1.70
1.81
1.93
2.06
2.20
2.35
18" Duct
Four
Boilers
Straight Run
0.08
0.08
0.09
0.09
0.10
0.11
0.11
0.12
0.13
90° Elbow
0.87
0.91
0.96
1.02
1.09
1.16
1.24
1.32
1.41
45° Elbow
0.68
0.71
0.75
0.80
0.85
0.91
0.97
1.03
1.10
Ent. Loss
2.57
2.70
2.83
3.02
3.22
3.44
3.67
3.91
4.18
20" Duct
Four
Boilers
Straight Run
0.05
0.05
0.05
0.06
0.06
0.06
0.07
0.07
0.08
90° Elbow
0.55
0.57
0.60
0.64
0.68
0.73
0.78
0.83
0.88
45° Elbow
0.43
0.45
0.47
0.50
0.53
0.57
0.61
0.65
0.69
Ent. Loss
1.69
1.77
1.86
1.98
2.11
2.26
2.41
2.57
2.74
NOTES : 1) Calculation assumes 700 scfm per boiler at full fire rate.
4) Units for “Straight Run” pressure drop values are (eq. ft. / foot).
5) Units for “Elbows” and “Ent. Loss” are (equivalent feet / item).