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MFC Series Boiler Vent and Combustion Air Guide
TABLE 5: Ducted Combustion Air Duct Pressure Drop (Eq. Ft.)
for MFC 10000 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 2335 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
0.29
0.31
3.12
3.28
2.44
2.56
8.78
9.21
0.16
0.17
1.85
1.94
1.45
1.52
5.48
5.75
0.36
0.38
4.64
4.87
3.62
3.80
14.38
15.09
0.22
0.23
3.04
3.19
2.37
2.48
9.82
10.30
0.48
0.51
6.83
7.17
5.32
5.58
22.10
23.18
0.31
0.33
4.61
4.84
3.59
3.77
15.60
16.37
0.54
0.57
8.20
8.61
6.39
6.70
27.74
29.10
0.36
0.38
5.68
5.96
4.43
4.64
20.14
21.13
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
0.32
0.34
0.37
3.44
3.67
3.91
2.68
2.86
3.05
9.66
10.31
11.00
0.18
0.19
0.20
2.04
2.18
2.32
1.59
1.70
1.81
6.03
6.43
6.86
0.39
0.42
0.45
5.11
5.45
5.82
3.99
4.25
4.54
15.83
16.89
18.01
0.24
0.26
0.28
3.34
3.57
3.80
2.60
2.78
2.96
10.81
11.53
12.30
0.53
0.57
0.60
7.52
8.02
8.56
5.86
6.25
6.67
24.33
25.95
27.68
0.34
0.36
0.39
5.08
5.42
5.78
3.95
4.22
4.50
17.18
18.32
19.55
0.60
0.63
0.68
9.03
9.63
10.28
7.03
7.50
8.00
30.54
32.57
34.75
0.40
0.42
0.45
6.26
6.68
7.12
4.87
5.20
5.55
22.17
23.65
25.23
33
60 °F
80 °F
100 °F
0.39
0.42
0.44
4.17
4.45
4.75
3.26
3.47
3.71
11.73
12.52
13.35
0.22
0.23
0.25
2.48
2.64
2.82
1.93
2.06
2.20
7.32
7.81
8.34
0.48
0.51
0.54
6.21
6.62
7.07
4.84
5.17
5.51
19.22
20.51
21.88
0.30
0.32
0.34
4.06
4.33
4.62
3.16
3.37
3.60
13.13
14.01
14.94
0.64
0.69
0.73
9.13
9.74
10.39
7.11
7.59
8.10
29.54
31.51
33.62
0.41
0.44
0.47
6.17
6.58
7.02
4.80
5.12
5.47
20.85
22.25
23.74
0.72
0.77
0.82
10.96
11.70
12.48
8.53
9.11
9.72
37.07
39.56
42.20
0.48
0.51
0.55
7.60
8.11
8.65
5.92
6.31
6.74
26.92
28.72
30.64
Page 29 of
120 °F
0.47
5.07
3.95
14.25
0.26
3.01
2.35
8.89
0.58
7.54
5.88
23.34
0.36
4.93
3.84
15.94
0.78
11.09
8.64
35.87
0.50
7.49
5.83
25.33
0.88
13.32
10.37
45.03
0.58
9.23
7.19
32.69
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