Specifications
Page 34 of 40 12/03/2013
Benchmark Series Boilers
Venting and Combustion Application Guide
GF-2050
TAG-0022_0S
AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 • Ph: 800-526-0288
Table 2f:
Ducted Combustion Air Duct Pressure Drop (Eq. Ft.) for BMK 3000 MMBTU 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 0.85 0.87 0.89 0.91 0.94 0.97 1.00 1.03 1.06
90° Elbow
4.75
4.98
5.23
5.58
5.95
6.35
6.77
7.23
7.71
45° Elbow
3.57
3.75
3.93
4.20
4.48
4.78
5.09
5.44
5.80
Ent. Loss
9.27
9.73
10.21
10.89
11.62
12.39
13.22
14.11
15.05
10" Duct
Single
Boiler
Straight Run
0.28
0.28
0.29
0.30
0.31
0.32
0.32
0.33
0.34
90° Elbow
1.60
1.68
1.77
1.88
2.01
2.14
2.29
2.44
2.60
45° Elbow
1.21
1.27
1.33
1.42
1.51
1.61
1.72
1.84
1.96
Ent. Loss 3.80 3.98 4.18 4.46 4.76 5.08 5.42 5.78 6.16
12" Duct
Two Boilers
Straight Run 0.35 0.37 0.38 0.41 0.43 0.46 0.49 0.52 0.55
90° Elbow 2.80 2.93 3.08 3.28 3.50 3.74 3.99 4.25 4.54
45° Elbow 2.13 2.23 2.34 2.50 2.67 2.85 3.04 3.24 3.46
Ent. Loss
7.33
7.69
8.07
8.60
9.18
9.79
10.45
11.15
11.89
14" Duct
Two Boilers
Straight Run
0.16
0.17
0.18
0.19
0.20
0.21
0.23
0.24
0.25
90° Elbow
1.45
1.53
1.60
1.71
1.82
1.94
2.07
2.21
2.36
45° Elbow
1.12
1.18
1.24
1.32
1.41
1.50
1.60
1.71
1.83
Ent. Loss
3.95
4.15
4.35
4.64
4.95
5.29
5.64
6.02
6.42
16" Duct
Three
Boilers
Straight Run
0.18
0.19
0.19
0.21
0.22
0.23
0.25
0.27
0.28
90° Elbow 1.90 1.99 2.09 2.23 2.38 2.54 2.71 2.89 3.08
45° Elbow 1.49 1.56 1.64 1.74 1.86 1.99 2.12 2.26 2.41
Ent. Loss 5.21 5.47 5.74 6.12 6.53 6.97 7.44 7.94 8.47
18" Duct
Three
Boilers
Straight Run 0.10 0.10 0.11 0.11 0.12 0.13 0.14 0.15 0.16
90° Elbow
1.16
1.22
1.28
1.37
1.46
1.56
1.66
1.77
1.89
45° Elbow
0.92
0.96
1.01
1.08
1.15
1.23
1.31
1.40
1.49
Ent. Loss
3.26
3.42
3.58
3.82
4.08
4.35
4.64
4.95
5.29
18" Duct
Four Boilers
Straight Run
0.17
0.18
0.19
0.20
0.21
0.22
0.24
0.25
0.27
90° Elbow
2.07
2.17
2.28
2.43
2.59
2.77
2.95
3.15
3.36
45° Elbow
1.63
1.71
1.80
1.92
2.04
2.18
2.33
2.48
2.65
Ent. Loss 5.79 6.07 6.37 6.80 7.25 7.74 8.25 8.81 9.40
20" Duct
Four Boilers
Straight Run 0.10 0.11 0.11 0.12 0.12 0.13 0.14 0.15 0.16
90° Elbow 1.30 1.37 1.44 1.53 1.63 1.74 1.86 1.98 2.12
45° Elbow 1.03 1.08 1.13 1.21 1.29 1.37 1.46 1.56 1.67
Ent. Loss
3.80
3.98
4.18
4.46
4.76
5.08
5.42
5.78
6.16
NOTES: 1) Calculation assumes 700 scfm per boiler at full fire rate
2) Units for "Straight Run" pressure drop values are (eq. ft. / foot)
3) Units for "Elbows" and "Ent. Loss" are (equivalent feet / item)