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MFC Series Boiler Vent and Combustion Air Guide
TABLE 5: Ducted Combustion Air Duct Pressure Drop (Eq. Ft.)
for MFC 8000 MMBTU Boiler
Inlet Duct
Duct Section
& No.
Type
Boilers
Straight Run
16" Duct
90° Elbow
Single
45° Elbow
Boiler
Ent. Loss
Straight Run
18" Duct
90° Elbow
Single
45° Elbow
Boiler
Ent. Loss
Straight Run
20" Duct
90° Elbow
Two
45° Elbow
Boilers
Ent. Loss
Straight Run
22" Duct
90° Elbow
Two
45° Elbow
Boilers
Ent. Loss
Straight Run
22" Duct
90° Elbow
Three
45° Elbow
Boilers
Ent. Loss
Straight Run
24" Duct
90° Elbow
Three
45° Elbow
Boilers
Ent. Loss
Straight Run
24" Duct
90° Elbow
Four
45° Elbow
Boilers
Ent. Loss
Straight Run
26" Duct
90° Elbow
Four
45° Elbow
Boilers
Ent. Loss
NOTES:
1) Calculation assumes 1870 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
0.19
0.20
2.00
2.10
1.56
1.64
5.63
5.91
0.11
0.11
1.19
1.25
0.93
0.97
3.51
3.69
0.23
0.25
2.98
3.13
2.32
2.44
9.22
9.68
0.15
0.15
1.95
2.04
1.52
1.59
6.30
6.61
0.31
0.33
4.38
4.60
3.41
3.58
14.17
14.87
0.20
0.21
2.96
3.11
2.30
2.42
10.01
10.50
0.35
0.37
5.26
5.52
4.10
4.30
17.79
18.67
0.24
0.25
3.65
3.83
2.84
2.98
12.92
13.55
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
0.21
0.22
0.24
2.20
2.35
2.51
1.72
1.83
1.96
6.20
6.61
7.05
0.12
0.12
0.13
1.31
1.40
1.49
1.02
1.09
1.16
3.87
4.13
4.40
0.26
0.27
0.29
3.28
3.50
3.73
2.56
2.73
2.91
10.15
10.83
11.55
0.16
0.17
0.18
2.14
2.29
2.44
1.67
1.78
1.90
6.94
7.40
7.89
0.35
0.37
0.39
4.82
5.15
5.49
3.76
4.01
4.28
15.60
16.64
17.76
0.22
0.24
0.25
3.26
3.48
3.71
2.54
2.71
2.89
11.02
11.75
12.54
0.39
0.41
0.44
5.79
6.18
6.59
4.51
4.81
5.13
19.59
20.89
22.29
0.26
0.28
0.29
4.01
4.28
4.57
3.13
3.33
3.56
14.22
15.17
16.18
33
60 °F
80 °F
100 °F
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
0.36
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
0.42
0.45
0.48
5.86
6.25
6.67
4.56
4.87
5.19
18.94
20.21
21.57
0.27
0.29
0.31
3.96
4.22
4.50
3.08
3.29
3.51
13.38
14.27
15.23
0.47
0.50
0.53
7.03
7.50
8.01
5.47
5.84
6.23
23.78
25.37
27.07
0.31
0.33
0.36
4.87
5.20
5.55
3.80
4.05
4.32
17.26
18.42
19.65
Page 28 of
120 °F
0.31
3.25
2.54
9.14
0.17
1.93
1.51
5.70
0.38
4.84
3.77
14.97
0.23
3.16
2.46
10.23
0.51
7.11
5.54
23.01
0.33
4.80
3.74
16.24
0.57
8.54
6.65
28.88
0.38
5.92
4.61
20.97
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