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Form: 2435
Revision: 9
Free Flex Installation and Operation Manual
Date: 9-1-2017
Bryan Steam LLC, 783 N Chili Ave, Peru IN 46970
Web:
www.
bryanboilers
.com
Phone:
765-473-6651
Fax:
765-473-3074
Email:
50
Appendix B
Vent and Combustion Air Pressure Drop Data
The combined pressure drop through the vent and combustion air duct shall not exceed 100
equivalent feet. Use the tables below to calculate the pressure drop in the vent / combustion
air system.
FF1000 Pressure Drop in Equivalent Feet (Flue Vent)
Flue Vent
Diameter (in.)
Straight Length
(eq ft/ft)
90
°
Elbow
(eq ft)
45
°
Elbow
(eq ft)
Velocity
(fpm)
6
1
10
5
1534
8
.22
2.22
1.11
863
FF1500 Pressure Drop in Equivalent Feet (Flue Vent)
8
.56
5.88
2.86
1296
10
.174
1.75
.87
829
FF2000 Pressure Drop in Equivalent Feet (Flue Vent)
8
1
10
5
1728
10
.31
3.125
1.56
1106
12
.12
1.19
.59
768
FF2500 Pressure Drop in Equivalent Feet (Flue Vent)
8
1.563
16.67
8.33
2158
10
.478
5
2.44
1381
12
.183
1.852
.92
959
FF3000 Pressure Drop in Equivalent Feet (Flue Vent)
8
2.22
25
11.11
2591
10
.68
7.14
3.57
1650
12
.267
2.7
1.35
1152
FF1000 Pressure Drop in Equivalent Feet (Combustion Air Duct)
Air Duct
Diameter (in.)
Straight Length
(eq ft/ft)
90
°
Elbow
(eq ft)
45
°
Elbow
(eq ft)
Velocity
(fpm)
6
.6
6.25
3.13
1121
8
.13
1.32
.658
631
FF1500 Pressure Drop in Equivalent Feet (Combustion Air Duct)
8
.3
3.03
1.49
946
10
.09
.92
.46
605
FF2000 Pressure Drop in Equivalent Feet (Combustion Air Duct)
8
.53
5.26
2.63
1264
10
.164
1.64
.82
809
12
.063
.63
.314
562
FF2500 Pressure Drop in Equivalent Feet (Combustion Air Duct)
8
.83
8.3
4.17
1576
10
.26
2.56
1.28
1009
12
.1
.98
.49
701
FF3000 Pressure Drop in Equivalent Feet (Combustion Air Duct)
8
1.19
12.5
5.9
1895
10
.37
3.7
1.85
1213
12
.14
1.41
.7
842