Check if low Pressure and low velocity duct design system is applicable. Consider minor losses equivalent length method with equivalent length of 10 for duct entrance loss, 35 for elbow loss, 8 for smooth reducer loss and 80 for reducer loss. GIVEN: Vmax=1200 FPM Fittings Equivalent Length (Le) Entrance, Le 10 Elbow, Le 35' Diffuser, Le-80 Pressure loss Max=0.10 to 0.20 H,0/100 ft for low and Medium Pressure Loss Duct

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Check if low Pressure and low velocity duct design system is applicable. Consider minor losses equivalent
length method with equivalent length of 10' for duct entrance loss, 35' for elbow loss, 8 for smooth reducer
loss and 80' for reducer loss.
GIVEN:
V max = 1200 FPM
Fittings Equivalent Length (Le)
Entrance, Le = 10
Elbow, Le = 35'
Diffuser, Le = 80'
Pressure loss Max = 0.10 to 0.20 H,0/100 ft for low and Medium Pressure Loss Duct
Duct
Index Run
Section Duct Section Junction
Fan
A-1
D-3
E-S
F-6
F-G
Fan-A
A-B
D-E
E-4
A
B
C
D
(
A
D
E
F
F
Description
duct entrance
main duct
reducer
main duct
elbow
main durt
reducer
main duct
reducer
main duct
reducer
main duct
branch duct
elbow
branch duct
elbow
branch duct
elbow
branch duct
reducer
branch duct
elbow
branch duct
elbow
branch duct
reducer
branch duct
elbow
Rectangular ducts are based on the table.
Length L Q Velocity Pressure Loss Total AP Round Duct Rectangular
+Le
CFM fpm H00/1000 H20 W.G Dinch) Duct (WxH) inch
2.137 1,200
9.011 180095541
0.0066 18.0695541
2,137 1,200
1,939 1150
0.11
0.11
0.11
0.11
1,999 1150
10
6
8
6
35
10
8
20
0.11
0.11
0.11
0.11
8
2
8
17
17
35
19
15
35
17 247
35
247
198
8
22
6
8
1,197
1.197
950 980
980
990
940
605
752
148
148
196
604
604
742
742
17
371
35 371
8
35
348
148
1060
1060
371
371
371
605
700
600
660
840
936
936
780
790
780
0.11
0.11
0.11
0.11
0.11
0.11
0.11
0.11
0.11
0.11
0.11
0.11
0.11
0.11
0.11
0.11
0.11
0.11
0.11
0.11
0.0088 17.5823039
0.0066 17.5803030
0.0885 14.3889777
0.011 14.3809777
0.0088 13.3316700
0.022 13.3316702
0.0088 12 1110219
0.0022
12.1110219
0.0187
6.69713168
6.69713368
0.0165 6.69713168
0.0385 6.69713368
0.0187 804331828
0.0885 8.04331828
0.0187 741645001
0.05
7.41645601
0.0009 11.4819228
0.0088 11.4819228
0.02:42 12.0599052
0.0385 12.0559052
0.0187 9.33846405
0.0385 9.33846405
0.0066 931866405
0.0088 9.33846405
0.0088 9.33806405
0.05
(33846405
26x 11
26x 11
Z4x 11
2x 11
20x9
20x9
17x9
17x9
16x8
16x8
6x6
6x6
6x6
9x6
9x6
8x6
8x6
14 x 8
14x9
14x9
11x7
11x7
11x7
11x7
11x7
11x7
Transcribed Image Text:Check if low Pressure and low velocity duct design system is applicable. Consider minor losses equivalent length method with equivalent length of 10' for duct entrance loss, 35' for elbow loss, 8 for smooth reducer loss and 80' for reducer loss. GIVEN: V max = 1200 FPM Fittings Equivalent Length (Le) Entrance, Le = 10 Elbow, Le = 35' Diffuser, Le = 80' Pressure loss Max = 0.10 to 0.20 H,0/100 ft for low and Medium Pressure Loss Duct Duct Index Run Section Duct Section Junction Fan A-1 D-3 E-S F-6 F-G Fan-A A-B D-E E-4 A B C D ( A D E F F Description duct entrance main duct reducer main duct elbow main durt reducer main duct reducer main duct reducer main duct branch duct elbow branch duct elbow branch duct elbow branch duct reducer branch duct elbow branch duct elbow branch duct reducer branch duct elbow Rectangular ducts are based on the table. Length L Q Velocity Pressure Loss Total AP Round Duct Rectangular +Le CFM fpm H00/1000 H20 W.G Dinch) Duct (WxH) inch 2.137 1,200 9.011 180095541 0.0066 18.0695541 2,137 1,200 1,939 1150 0.11 0.11 0.11 0.11 1,999 1150 10 6 8 6 35 10 8 20 0.11 0.11 0.11 0.11 8 2 8 17 17 35 19 15 35 17 247 35 247 198 8 22 6 8 1,197 1.197 950 980 980 990 940 605 752 148 148 196 604 604 742 742 17 371 35 371 8 35 348 148 1060 1060 371 371 371 605 700 600 660 840 936 936 780 790 780 0.11 0.11 0.11 0.11 0.11 0.11 0.11 0.11 0.11 0.11 0.11 0.11 0.11 0.11 0.11 0.11 0.11 0.11 0.11 0.11 0.0088 17.5823039 0.0066 17.5803030 0.0885 14.3889777 0.011 14.3809777 0.0088 13.3316700 0.022 13.3316702 0.0088 12 1110219 0.0022 12.1110219 0.0187 6.69713168 6.69713368 0.0165 6.69713168 0.0385 6.69713368 0.0187 804331828 0.0885 8.04331828 0.0187 741645001 0.05 7.41645601 0.0009 11.4819228 0.0088 11.4819228 0.02:42 12.0599052 0.0385 12.0559052 0.0187 9.33846405 0.0385 9.33846405 0.0066 931866405 0.0088 9.33846405 0.0088 9.33806405 0.05 (33846405 26x 11 26x 11 Z4x 11 2x 11 20x9 20x9 17x9 17x9 16x8 16x8 6x6 6x6 6x6 9x6 9x6 8x6 8x6 14 x 8 14x9 14x9 11x7 11x7 11x7 11x7 11x7 11x7
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