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Bryan Steam, LLC
www.bryanboilers.com
Phone: 765-473-6651
783 N Chili Ave, Peru, IN 46970 [email protected]
Combined pressure drop through the Vent duct shall not exceed 100 equivalent feet (30.84 meters).
Table 6: Vent Air Pressure Drop Data
Flue Vent Diameter
in. (mm)
Straight Length Equivalent
ft/ft (m/m)
90° Elbow Equivalent
ft/ft (m/m)
45° Elbow Equivalent
ft/ft (m/m)
Velocity
(fpm)
Free Flex 1000 Pressure Drop in Equivalent Feet (Meters)
6 (160)
1 (0.304)
10 (3.04)
5 (1.524)
1534
8 (200)
0.22 (0.07)
2.22 (0.676)
1.11 (0.338)
863
Free Flex 1500 Pressure Drop in Equivalent Feet (Meters)
8 (200)
0.56 (0.17)
5.88 (1.792)
2.86 (0.871)
1296
10 (250)
0.174 (0.053)
1.75 (0.533)
0.87 (0.265)
829
Free Flex 2000 Pressure Drop in Equivalent Feet (Meters)
8 (200)
1 (0.03)
10 (3.048)
5 (1.524)
1728
10 (250)
0.31 (0.09)
3.125 (0.952)
1.56 (0.475)
1106
12 (315)
0.12 (0.036)
1.19 (0.362)
0.59 (0.179)
768
Free Flex 2500 Pressure Drop in Equivalent Feet (Meters)
8 (200)
1.56 (0.047)
16.67 (5.081)
8.33 (2.538)
2158
10 (250)
0.478 (0.145)
5 (1.524)
2.44 (0.743)
1381
12 (315)
0.183 (0.055)
1.852 (0.564)
0.92 (0.28)
959
Free Flex 3000 Pressure Drop in Equivalent Feet (Meters)
8 (200)
2.22 (0.068)
25 (7.62)
11.11 (3.386)
2591
10 (250)
0.68 (0.207)
7.14 (2.176)
3.57 (1.088)
1658
12 (315)
0.267 (0.081)
2.7 (0.822)
1.35 (0.411)
1152
Free Flex 3500 Pressure Drop in Equivalent Feet (Meters)
10 (250)
0.455 (0.138)
4.55 (1.386)
2.727 (0.831)
1935
12 (315)
0.172 (0.052)
1.724 (0.525)
0.862 (0.252)
1344
14 (356)
0.08 (0.024)
0.77 (0.234)
3.85 (1.173)
987
Free Flex 4000 Pressure Drop in Equivalent Feet (Meters)
10 (250)
0.95 (0.289)
10 (3.048)
4.76 (4.76)
2212
12 (315)
0.37 (0.112)
3.7 (1.127)
1.85 (0.563)
1536
14 (356)
0.16 (0.048)
1.64 (0.499)
0.81 (0.248)
1129
Free Flex 4500 Pressure Drop in Equivalent Feet (Meters)
12 (315)
0.47 (0.143)
4.76 (1.45)
2.33 (0.71)
1729
14 (356)
0.21 (0.064)
2.08 (0.633)
1.03 (0.313)
1270
16 (406)
0.1 (0.03)
1.02 (0.31)
0.51 (0.155)
972
Free Flex 5000 Pressure Drop in Equivalent Feet (Meters)
12 (315)
0.57 (0.173)
5.71 (1.74)
2.85 (0.868)
1920
14 (356)
0.25 (0.076)
2.56 (0.78)
1.27 (0.387)
1410
16 (406)
0.13 (0.039)
1.27 (0.387)
0.63 (0.192)
1080
Free Flex 5500 Pressure Drop in Equivalent Feet (Meters)
12 (315)
0.69 (0.21)
6.9 (2.103)
3.45 (1.051)
2112
14 (356)
0.31 (0.094)
3.13 (0.954)
1.54 (0.469)
1552
16 (406)
0.15 (0.045)
1.52 (0.463)
0.76 (0.231)
1188
Free Flex 6000 Pressure Drop in Equivalent Feet (Meters)
12 (315)
0.83 (0.252)
8.33 (2.538)
4.17 (1.271)
2304
14 (356)
0.36 (0.109)
3.7 (1.127)
1.85 (0.563)
1693
16 (406)
0.19 (0.057)
1.82 (0.554)
0.91 (0.277)
1296