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MFC Series Boiler Vent and Combustion Air Guide
TABLE 5: Ducted Combustion Air Duct Pressure Drop (Eq. Ft.)
for MFC 4000 MMBTU Boiler
Inlet Duct
Duct Section
& No.
Type
Boilers
Straight Run
12" Duct
90° Elbow
Single
45° Elbow
Boiler
Ent. Loss
Straight Run
14"
90° Elbow
Duct
Single
45° Elbow
Boiler
Ent. Loss
Straight Run
16"
90° Elbow
Duct
Two
45° Elbow
Boilers
Ent. Loss
Straight Run
18"
90° Elbow
Duct
Two
45° Elbow
Boilers
Ent. Loss
Straight Run
18"
90° Elbow
Duct
Three
45° Elbow
Boilers
Ent. Loss
Straight Run
20"
90° Elbow
Duct
Three
45° Elbow
Boilers
Ent. Loss
Straight Run
20"
90° Elbow
Duct
45° Elbow
Four
Boilers
Ent. Loss
Straight Run
22"
90° Elbow
Duct
Four
45° Elbow
Boilers
Ent. Loss
NOTES:
1) Calculation assumes 935 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)
TAG-0080_OG • GF-148-V •
-30 °F
-15 °F
0 °F
0.22
0.23
0.24
1.81
1.90
1.99
1.40
1.47
1.54
4.45
4.67
4.90
0.10
0.11
0.11
0.91
0.95
1.00
0.71
0.74
0.78
2.40
2.52
2.64
0.19
0.20
0.21
2.00
2.10
2.20
1.56
1.64
1.72
5.63
5.91
6.20
0.11
0.11
0.12
1.19
1.25
1.31
0.93
0.97
1.02
3.51
3.69
3.87
0.23
0.24
0.25
2.67
2.81
2.94
2.09
2.19
2.30
7.91
8.30
8.71
0.14
0.14
0.15
1.68
1.76
1.85
1.31
1.37
1.44
5.19
5.44
5.71
0.23
0.25
0.26
2.98
3.13
3.28
2.32
2.44
2.56
10.1
9.22
9.68
0.15
0.15
0.16
1.95
2.04
2.14
1.52
1.59
1.67
6.30
6.61
6.94
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3/29/2023
OUTSIDE AIR TEMPERATURE (°F)
20 °F
40 °F
0.26
0.27
2.13
2.27
1.64
1.75
5.22
5.57
0.12
0.13
1.06
1.14
0.83
0.88
2.82
3.01
0.22
0.24
2.35
2.51
1.83
1.96
6.61
7.05
0.12
0.13
1.40
1.49
1.09
1.16
4.13
4.40
0.27
0.29
3.14
3.35
2.45
2.61
9.29
9.91
0.16
0.17
1.97
2.10
1.54
1.64
6.09
6.50
0.27
0.29
3.50
3.73
2.73
2.91
10.83
11.55
5
0.17
0.18
2.29
2.44
1.78
1.90
7.40
7.89
33
100
60 °F
80 °F
°F
0.29
0.31
0.33
2.42
2.58
2.75
1.87
2.00
2.13
5.95
6.34
6.77
0.14
0.15
0.15
1.21
1.29
1.38
0.94
1.01
1.07
3.21
3.42
3.65
0.25
0.27
0.29
2.68
2.86
3.05
2.09
2.23
2.38
7.52
8.03
8.57
0.14
0.15
0.16
1.59
1.69
1.81
1.24
1.32
1.41
4.70
5.01
5.35
0.31
0.33
0.35
3.57
3.81
4.07
2.79
2.98
3.18
10.57
11.28
12.03
0.18
0.19
0.21
2.24
2.39
2.55
1.75
1.86
1.99
6.93
7.40
7.89
0.31
0.33
0.36
3.98
4.25
4.53
3.11
3.31
3.54
12.33
13.15
14.03
0.19
0.21
0.22
2.60
2.78
2.96
2.03
2.16
2.31
8.42
8.98
9.58
Page 24 of
120 °F
0.35
2.94
2.27
7.22
0.17
1.47
1.15
3.90
0.31
3.25
2.54
9.14
0.17
1.93
1.51
5.70
0.37
4.34
3.39
12.84
0.22
2.72
2.12
8.42
0.38
4.84
3.77
14.97
0.23
3.16
2.46
10.23
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