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MFC Series Boiler Vent and Combustion Air Guide
TABLE 5: Ducted Combustion Air Duct Pressure Drop (Eq. Ft.)
for MFC 5000 MMBTU Boiler
Inlet Duct
& No.
Duct Section Type
Boilers
Straight Run
1
2"
90° Elbow
Duct
Single
45° Elbow
Boiler
Ent. Loss
Straight Run
14"
90° Elbow
Duct
Single
45° Elbow
Boiler
Ent. Loss
Straight Run
16"
90° Elbow
Duct
45° Elbow
Two
Boilers
Ent. Loss
Straight Run
16"
90° Elbow
Duct
Two
45° Elbow
Boilers
Ent. Loss
Straight Run
18"
90° Elbow
Duct
45° Elbow
Three
Boilers
Ent. Loss
Straight Run
20"
90° Elbow
Duct
45° Elbow
Three
Boilers
Ent. Loss
Straight Run
20"
90° Elbow
Duct
45° Elbow
Four
Boilers
Ent. Loss
Straight Run
22"
90° Elbow
Duct
45° Elbow
Four
Boilers
Ent. Loss
TAG-0080_OG • GF-148-V •
-30 °F
-15 °F
0.33
0.35
2.83
2.97
2.19
2.30
6.96
7.31
0.15
0.16
1.42
1.49
1.10
1.16
3.76
3.94
0.29
0.31
3.14
3.29
2.45
2.57
8.81
9.25
0.16
0.17
1.86
1.95
1.45
1.52
5.50
5.77
0.35
0.37
4.19
4.39
3.27
3.43
12.38
12.99
0.21
0.22
2.62
2.75
2.05
2.15
8.12
8.52
0.36
0.38
4.66
4.89
3.64
3.82
14.44
15.15
0.22
0.23
3.05
3.20
2.38
2.49
9.86
10.35
Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST
3/29/2023
OUTSIDE AIR TEMPERATURE (°F)
0 °F
20 °F
40 °F
0.37
0.39
0.42
3.12
3.33
3.55
2.41
2.57
2.75
7.67
8.18
8.73
0.17
0.18
0.19
1.56
1.67
1.78
1.22
1.30
1.38
4.14
4.41
4.71
0.32
0.34
0.37
3.45
3.68
3.93
2.69
2.87
3.06
9.70
10.35
11.04
0.18
0.19
0.20
2.05
2.19
2.33
1.60
1.71
1.82
6.06
6.46
6.89
0.39
0.41
0.44
4.61
4.92
5.24
3.60
3.84
4.09
13.6
14.54
15.51
3
0.23
0.24
0.26
2.89
3.08
3.29
2.25
2.40
2.56
8.94
9.54
10.18
0.40
0.42
0.45
5.14
5.48
5.84
4.01
4.27
4.56
15.9
16.96
18.09
0
0.24
0.26
0.28
3.36
3.58
3.82
2.62
2.79
2.98
10.8
11.58
12.36
6
33
100
60 °F
80 °F
°F
0.45
0.48
0.51
3.79
4.04
4.31
2.93
3.13
3.34
9.31
9.93
10.60
0.21
0.22
0.23
1.90
2.02
2.16
1.48
1.58
1.68
5.02
5.36
5.72
0.39
0.42
0.45
4.19
4.47
4.77
3.27
3.49
3.72
12.5
11.78
13.41
7
0.22
0.23
0.25
2.49
2.65
2.83
1.94
2.07
2.21
7.36
7.85
8.37
0.47
0.50
0.53
5.60
5.97
6.37
4.37
4.66
4.97
17.6
16.55
18.84
6
0.28
0.30
0.31
3.51
3.74
3.99
2.74
2.92
3.11
11.5
10.86
12.36
8
0.48
0.51
0.55
6.23
6.65
7.10
4.86
5.19
5.54
20.5
19.30
21.97
9
0.30
0.32
0.34
4.08
4.35
4.64
3.18
3.39
3.61
14.0
13.18
15.01
7
Page 25 of
120
°F
0.54
4.60
3.56
11.31
0.25
2.30
1.79
6.10
0.47
5.09
3.97
14.31
0.26
3.02
2.36
8.93
0.57
6.80
5.30
20.10
0.34
4.26
3.32
13.19
0.58
7.57
5.91
23.44
0.36
4.95
3.86
16.01
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