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MFC Series Boiler Vent and Combustion Air Guide
TABLE 5: Ducted Combustion Air Duct Pressure Drop (Eq. Ft.)
for MFC 6000 MMBTU Boiler
Inlet Duct
Duct Section
& No.
Type
Boilers
Straight Run
14" Duct
90° Elbow
Single
45° Elbow
Boiler
Ent. Loss
Straight Run
16" Duct
90° Elbow
Single
45° Elbow
Boiler
Ent. Loss
Straight Run
18" Duct
90° Elbow
Two
45° Elbow
Boilers
Ent. Loss
Straight Run
20" 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 1200 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
0.16
0.17
1.49
1.57
1.16
1.22
3.95
4.15
0.08
0.09
0.82
0.86
0.64
0.67
2.32
2.43
0.17
0.18
1.96
2.05
1.53
1.60
5.79
6.07
0.10
0.11
1.23
1.29
0.96
1.00
3.80
3.98
0.13
0.14
1.80
1.89
1.41
1.47
5.84
6.12
0.09
0.09
1.22
1.28
0.95
1.00
4.12
4.32
0.15
0.16
2.17
2.27
1.69
1.77
7.33
7.69
0.10
0.11
1.50
1.57
1.17
1.23
5.32
5.58
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
0.18
0.19
0.20
1.64
1.75
1.87
1.28
1.36
1.46
4.35
4.64
4.95
0.09
0.10
0.10
0.91
0.97
1.03
0.71
0.76
0.81
2.55
2.72
2.90
0.19
0.20
0.21
2.15
2.30
2.45
1.68
1.79
1.91
6.37
6.80
7.25
0.11
0.12
0.13
1.35
1.44
1.54
1.05
1.12
1.20
4.18
4.46
4.76
0.15
0.16
0.17
1.99
2.12
2.26
1.55
1.65
1.76
6.43
6.85
7.31
0.10
0.10
0.11
1.34
1.43
1.53
1.04
1.11
1.19
4.54
4.84
5.16
0.17
0.18
0.19
2.39
2.54
2.71
1.86
1.98
2.11
8.07
8.60
9.18
0.11
0.12
0.13
1.65
1.76
1.88
1.29
1.37
1.46
5.86
6.25
6.66
33
100
60 °F
80 °F
°F
0.22
0.23
0.25
2.00
2.13
2.27
1.55
1.66
1.77
5.29
5.64
6.02
0.11
0.12
0.13
1.10
1.18
1.25
0.86
0.92
0.98
3.10
3.31
3.53
0.23
0.24
0.26
2.62
2.79
2.98
2.04
2.18
2.32
7.74
8.25
8.81
0.13
0.14
0.15
1.64
1.75
1.87
1.28
1.36
1.46
5.08
5.42
5.78
0.18
0.19
0.20
2.41
2.57
2.75
1.88
2.00
2.14
7.80
8.32
8.88
0.12
0.12
0.13
1.63
1.74
1.85
1.27
1.35
1.44
5.51
5.88
6.27
0.20
0.21
0.23
2.90
3.09
3.30
2.25
2.40
2.57
10.4
9.79
11.15
5
0.13
0.14
0.15
2.01
2.14
2.28
1.56
1.67
1.78
7.11
7.59
5.78
Page 27 of
120
°F
0.26
2.42
1.89
6.42
0.13
1.34
1.04
3.76
0.28
3.18
2.48
9.40
0.16
1.99
1.55
6.16
0.22
2.93
2.28
9.47
0.14
1.98
1.54
6.69
0.24
3.52
2.74
11.89
0.16
2.44
1.90
8.63
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