Specifications
12/03/2013 Page 35 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 2g:
Ducted Combustion Air Duct Pressure Drop for BMK 6000 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
14" Duct
Single
Boiler
Straight Run
0.16
0.17
0.18
0.19
0.20
0.22
0.23
0.25
0.26
90° Elbow
1.49
1.57
1.64
1.75
1.87
2.00
2.13
2.27
2.42
45° Elbow
1.16
1.22
1.28
1.36
1.46
1.55
1.66
1.77
1.89
Ent. Loss
3.95
4.15
4.35
4.64
4.95
5.29
5.64
6.02
6.42
16" Duct
Single
Boiler
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
Two
Boilers
Straight Run
0.17
0.18
0.19
0.20
0.21
0.23
0.24
0.26
0.28
90° Elbow
1.96
2.05
2.15
2.30
2.45
2.62
2.79
2.98
3.18
45° Elbow
1.53
1.60
1.68
1.79
1.91
2.04
2.18
2.32
2.48
Ent. Loss
5.79
6.07
6.37
6.80
7.25
7.74
8.25
8.81
9.40
20" Duct
Two
Boilers
Straight Run
0.10
0.11
0.11
0.12
0.13
0.13
0.14
0.15
0.16
90° Elbow
1.23
1.29
1.35
1.44
1.54
1.64
1.75
1.87
1.99
45° Elbow
0.96
1.00
1.05
1.12
1.20
1.28
1.36
1.46
1.55
Ent. Loss
3.80
3.98
4.18
4.46
4.76
5.08
5.42
5.78
6.16
22" Duct
Three
Boilers
Straight Run
0.13
0.14
0.15
0.16
0.17
0.18
0.19
0.20
0.22
90° Elbow
1.80
1.89
1.99
2.12
2.26
2.41
2.57
2.75
2.93
45° Elbow
1.41
1.47
1.55
1.65
1.76
1.88
2.00
2.14
2.28
Ent. Loss
5.84
6.12
6.43
6.85
7.31
7.80
8.32
8.88
9.47
24" Duct
Three
Boilers
Straight Run
0.09
0.09
0.10
0.10
0.11
0.12
0.12
0.13
0.14
90° Elbow
1.22
1.28
1.34
1.43
1.53
1.63
1.74
1.85
1.98
45° Elbow
0.95
1.00
1.04
1.11
1.19
1.27
1.35
1.44
1.54
Ent. Loss
4.12
4.32
4.54
4.84
5.16
5.51
5.88
6.27
6.69
24" Duct
Four
Boilers
Straight Run
0.15
0.16
0.17
0.18
0.19
0.20
0.21
0.23
0.24
90° Elbow
2.17
2.27
2.39
2.54
2.71
2.90
3.09
3.30
3.52
45° Elbow
1.69
1.77
1.86
1.98
2.11
2.25
2.40
2.57
2.74
Ent. Loss
7.33
7.69
8.07
8.60
9.18
9.79
10.45
11.15
11.89
26" Duct
Four
Boilers
Straight Run
0.10
0.11
0.11
0.12
0.13
0.13
0.14
0.15
0.16
90° Elbow
1.50
1.57
1.65
1.76
1.88
2.01
2.14
2.28
2.44
45° Elbow
1.17
1.23
1.29
1.37
1.46
1.56
1.67
1.78
1.90
Ent. Loss
5.32
5.58
5.86
6.25
6.66
7.11
7.59
5.78
8.63
NOTES: 1) Calculation assumes 1200 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 (equivilent feet / item)