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MFC Series Boiler Vent and Combustion Air Guide
TABLE 5: Ducted Combustion Air Duct Pressure Drop
for MFC 3000 MMBTU Boiler
Inlet Duct
Duct Section
& No.
Type
Boilers
Straight Run
8" Duct
90° Elbow
Single
45° Elbow
Boiler
Ent. Loss
Straight Run
10" Duct
90° Elbow
Single
45° Elbow
Boiler
Ent. Loss
Straight Run
12" Duct
90° Elbow
Two
45° Elbow
Boilers
Ent. Loss
Straight Run
14" Duct
90° Elbow
Two
45° Elbow
Boilers
Ent. Loss
Straight Run
16" Duct
90° Elbow
Three
45° Elbow
Boilers
Ent. Loss
Straight Run
18" Duct
90° Elbow
Three
45° Elbow
Boilers
Ent. Loss
Straight Run
18" Duct
90° Elbow
Four
45° Elbow
Boilers
Ent. Loss
Straight Run
20" Duct
90° Elbow
Four
45° Elbow
Boilers
Ent. Loss
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)
TAG-0080_OG • GF-148-V •
-30 °F
-15 °F
0.85
0.87
4.75
4.98
3.57
3.75
9.27
9.73
0.28
0.28
1.60
1.68
1.21
1.27
3.80
3.98
0.35
0.37
2.80
2.93
2.13
2.23
7.33
7.69
0.16
0.17
1.45
1.53
1.12
1.18
3.95
4.15
0.18
0.19
1.90
1.99
1.49
1.56
5.21
5.47
0.10
0.10
1.16
1.22
0.92
0.96
3.26
3.42
0.17
0.18
2.07
2.17
1.63
1.71
5.79
6.07
0.10
0.11
1.30
1.37
1.03
1.08
3.80
3.98
Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST
3/29/2023
Eq. Ft.)
(
OUTSIDE AIR TEMPERATURE (°F)
0 °F
20 °F
40 °F
0.89
0.91
0.94
5.23
5.58
5.95
3.93
4.20
4.48
10.21
10.89
11.62
0.29
0.30
0.31
1.77
1.88
2.01
1.33
1.42
1.51
4.18
4.46
4.76
0.38
0.41
0.43
3.08
3.28
3.50
2.34
2.50
2.67
8.07
8.60
9.18
0.18
0.19
0.20
1.60
1.71
1.82
1.24
1.32
1.41
4.35
4.64
4.95
0.19
0.21
0.22
2.09
2.23
2.38
1.64
1.74
1.86
5.74
6.12
6.53
0.11
0.11
0.12
1.28
1.37
1.46
1.01
1.08
1.15
3.58
3.82
4.08
0.19
0.20
0.21
2.28
2.43
2.59
1.80
1.92
2.04
6.37
6.80
7.25
0.11
0.12
0.12
1.44
1.53
1.63
1.13
1.21
1.29
4.18
4.46
4.76
33
60 °F
80 °F
100 °F
0.97
1.00
1.03
6.35
6.77
7.23
4.78
5.09
5.44
12.39
13.22
14.11
0.32
0.32
0.33
2.14
2.29
2.44
1.61
1.72
1.84
5.08
5.42
5.78
0.46
0.49
0.52
3.74
3.99
4.25
2.85
3.04
3.24
9.79
10.45
11.15
0.21
0.23
0.24
1.94
2.07
2.21
1.50
1.60
1.71
5.29
5.64
6.02
0.23
0.25
0.27
2.54
2.71
2.89
1.99
2.12
2.26
6.97
7.44
7.94
0.13
0.14
0.15
1.56
1.66
1.77
1.23
1.31
1.40
4.35
4.64
4.95
0.22
0.24
0.25
2.77
2.95
3.15
2.18
2.33
2.48
7.74
8.25
8.81
0.13
0.14
0.15
1.74
1.86
1.98
1.37
1.46
1.56
5.08
5.42
5.78
Page 23 of
120 °F
1.06
7.71
5.80
15.05
0.34
2.60
1.96
6.16
0.55
4.54
3.46
11.89
0.25
2.36
1.83
6.42
0.28
3.08
2.41
8.47
0.16
1.89
1.49
5.29
0.27
3.36
2.65
9.40
0.16
2.12
1.67
6.16
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