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MFC Series Boiler Vent and Combustion Air Guide
19. Pressure Drop and Draft Data Tables
TABLE 4: Discharge Flue Vent Pressure Drop (Eq. Ft.)
Single MFC 3000 Boiler (Assuming 180°F Water Temperature and 20°F Rise at Sea Level)
FLUE VENT
(IN. DIA.)
8
10
12
14
16
Single MFC 4000 Boiler (Assuming 180°F Water Temperature and 20°F Rise at Sea Level)
FLUE VENT
(IN. DIA.)
12
14
16
18
20
Single MFC 5000 Boiler (Assuming 180°F Water Temperature and 20°F Rise at Sea Level)
FLUE VENT
(IN. DIA.)
12
14
16
18
20
Single MFC 6000 Boiler (Assuming 180°F Water Temperature and 20°F Rise at Sea Level)
FLUE VENT
(IN. DIA.)
12
14
16
18
20
TAG-0080_OG • GF-148-V •
FLUE
STRAIGHT
VELOCITY
RUN (EQ. FT
(FT/SEC)
/ FOOT)
29.28
1.24
19.13
0.40
13.28
0.16
9.76
0.08
7.47
0.04
FLUE
STRAIGHT
VELOCITY
RUN (EQ. FT
(FT/SEC)
/ FOOT)
24.30
0.38
17.85
0.18
13.67
0.09
10.80
0.05
8.75
0.03
FLUE
STRAIGHT
VELOCITY
RUN (EQ. FT
(FT/SEC)
/ FOOT)
30.40
0.58
22.34
0.27
17.10
0.14
13.51
0.08
10.94
0.05
FLUE
STRAIGHT
VELOCITY
RUN (EQ. FT
(FT/SEC)
/ FOOT)
30.59
0.64
22.48
0.29
17.21
0.15
13.60
0.08
11.01
0.05
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3/29/2023
90° ELBOW
45° ELBOW
(EQ. FT)
(EQ. FT)
7.54
5.68
2.68
2.05
1.17
0.90
0.58
0.46
0.32
0.25
90° ELBOW
45° ELBOW
(EQ. FT)
(EQ. FT)
3.91
3.03
1.96
1.52
1.08
0.84
0.64
0.50
0.40
0.31
90° ELBOW
45° ELBOW
(EQ. FT)
(EQ. FT)
6.13
4.74
3.07
2.39
1.69
1.32
1.01
0.78
0.63
0.49
90° ELBOW
45° ELBOW
(EQ. FT)
(EQ. FT)
6.20
4.80
3.11
2.42
1.72
1.34
1.02
0.79
0.64
0.50
33
EXIT LOSS
EXIT LOSS
HORIZ. TERM.
RAIN CAP
(EQ. FT)
(EQ. FT)
11.58
21.50
4.74
8.81
2.29
4.25
1.23
2.29
0.72
1.34
EXIT LOSS
EXIT LOSS
HORIZ. TERM.
RAIN CAP
(EQ. FT)
(EQ. FT)
7.65
14.21
4.13
7.67
2.42
4.49
1.51
2.81
0.99
1.84
EXIT LOSS
EXIT LOSS
HORIZ. TERM.
RAIN CAP
(EQ. FT)
(EQ. FT)
11.98
22.24
6.47
12.01
3.79
7.04
2.37
4.39
1.55
2.88
EXIT LOSS
EXIT LOSS
HORIZ. TERM.
RAIN CAP
(EQ. FT)
(EQ. FT)
12.13
22.53
6.55
12.16
3.84
7.13
2.40
4.45
1.57
2.92
Page 21 of
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