Duct or Fittings W. cm H.

cm Section(m²) Length or # Flow(l/s) C0 Value De(in) V (m/s) VP (Pa)

Duct (straight) 10 15 0.015 15 103 5.26 6.87 28.38
DIFFUSER 15 15 24
FireDamper 20 20 0.04 96 0.12 2.40 3.47
Damper inside duct 20 10 0.02 24 #N/A 1.20 0.87
Damper at duct extremity 30 20 0.06 24 5.25 0.40 0.10
Damper at plenum extremity 30 20 0.06 24 6.15 0.40 0.10
LOUVER 40 40 0.078 103
Elbow H 25 W0 / W1 2.13 Qty Flow (l/s) C0 Value V (m/s) VP (Pa)
Variable W0 32 H / W1 1.67 30 3.36 0.5875 0.21
I/O Supply W1 15 2.00
Elbow f ( Mitered, Rect. ) H 15 f H/ W Qty Flow (l/s) C0 Value V (m/s) VP (Pa)
W 25 90 0.60 5 103 1.27 2.7466667 4.54
Elbow F ( r = 10cm ) H 15 r/H W/H Qty Flow (l/s) C0 Value V (m/s) VP (Pa)
Smooth Radius W 25 0.67 1.67 1 103 0.66 2.75 4.54
F 90.00
Elbow,Converging or Diverging H1 W1 H0 W0 Qty Flow (l/s) C0 Value V (m/s) VP (Pa)
Flow, Rectangular. 45.00 15.00 30.00 15.00 1 200 1.526 4.44 11.89
H0/W0 2.00 W1/W0 1.00
Diverging Tee Qc(l/s) 200.00 Qty Area(m2) C0 Value V (m/s) VP (Pa)
Qs(l/s) 100.00 Qb/Qc 0.50 1 0.02 0.56 10.00 60.20
Qb(l/s) 100.00 Qs/Qc 0.50 1 0.01 0.2 10.00 60.20
Elbow H 36 W1 / W0 0.86 Qty Flow (l/s) C0 Value V (m/s) VP (Pa)
Variable W0 35 H / W0 1.03 40.00 1.43 0.34 0.07
I/O Exhaust W1 30 0.86
Conical H1 35 q A0 / A1 Qty Flow (l/s) C0 Value V (m/s) VP (Pa)
Two sides H0 20 17.06 0.57 40 0.15 0.45 0.12
//, Exhaust W 35 0.57
L 50
Conical H1 35 q A0 / A1 Qty Flow (l/s) C0 Value V (m/s) VP (Pa)
Two sides H0 20 33.40 0.57 40 0.06 0.45 0.12
//, Supply W 35 0.57
L 50
Cent. Fan L D0 L / D0 Qty Flow (l/s) C0 Value V (m/s) VP (Pa)
located in 20 35 0.57 55.00 0.4 0.57 0.20
Cabinet
Elbow Z H 90 Re/1000 Cp Value Qty Flow (l/s) C0 Value V (m/s) VP (Pa)
Shaped W 40 40.95 2.77 33 3.16 0.09 0.01
L 100
 L/W 2.5
H/W 2.25
De 34.19
Screen H1 15 n A1 / A0 Qty Flow (l/s) C0 Value V (m/s) VP (Pa)
H0 15 0.50 1.00 1 103 1.65 2.75 4.54
W1 25
W0 25
TOTAL
C : FITTING LOSS COEFFICIENT
DPL : DUCT PRESSURE LOSS
DP (Pa)
75.49

0.00
#N/A
0.00
0.00
15.00
DP(Pa)
0.00

DP(Pa)
28.84
DP(Pa)
2.98

DP(Pa)
18.15

DP(Pa)
33.71
12.04
DP(Pa)
0.00

DP(Pa)
0.00

DP(Pa)
0.00

DP(Pa)
0.00

DP(Pa)
0.00
DP(Pa)
7.49

#N/A
DELTA P W(M) H(M) A(M2) L(M) f' Dh(MM) V(M/S) Q(L/S) Re epsilon f
$1.69 0.2 0.2 0.04 4.2 0.12983797 200 2.4 96 31872 0.09 0.1298
0.00028419

D P( Pa ) W(m) H(m) A(ft2) L(m) De(in) V(fpm) Q(l/s) Re f

3.41 0.15 0.1 0.1614 9.6 5.26342139 314.8795 24 110048 0.9
0.492 0.328 31.488 50.814

SR3-1 Elbow, 90 Degree, Variable Inlet/Outlet Area, Supply Air Systems.

C0 Values
W0 / W1
H / W1
2 1.6 1.4 1.2 1 0.8 0.6
0.25 4.24 2.71 2.14 1.64 1.24 0.92 0.63
1 3.36 2.3 1.86 1.47 1.15 0.87 0.61
4 2.64 1.84 1.49 1.17 0.9 0.7 0.53
100 2.2 1.54 1.23 0.99 0.79 0.67 0.54

C0 Value H W0 W1 H / W1 W0 / W 1 Q (L/S) V(m/s)

0.92 0.25 0.2 0.3 0.833333 0.66666667 24 0.4
2
7

Damper, Opposed Blades ,Inside duct .

C0 Values
 Width
Height
20 30 40 50 60 70 80 90 100 105 120
15 11.74 11.74 6.34 6.34 5.14 5.14 4.63 4.63 4.63 4.3 4.3
20 6.34 4.3 4.3 2.41 2.41 2.41 2.41 1.69 1.69 1.69 1.69
30 4.3 2.41 1.69 1.32 1.32 1.1 1.1 1.1 1.1 1.1 1.1
40 2.41 1.32 1.1 0.9 0.9 0.76 0.76 0.76 0.76 0.65 0.65
50 2.41 1.32 1.1 0.9 0.9 0.76 0.76 0.76 0.76 0.76 0.76
60 1.69 1.1 0.9 0.76 0.65 0.64 0.64 0.64 0.64 0.64 0.64
70 1.69 1.1 0.9 0.76 0.64 0.64 0.64 0.64 0.64 0.64 0.64
80 1.69 0.9 0.76 0.64 0.64 0.64 0.51 0.51 0.51 0.51 0.51
90 1.32 0.9 0.64 0.64 0.51 0.51 0.51 0.44 0.44 0.42 0.42
100 1.32 0.9 0.64 0.64 0.51 0.51 0.51 0.44 0.42 0.42 0.42
110 1.32 0.76 0.64 0.64 0.51 0.44 0.42 0.42 0.42 0.42 0.42
120 1.32 0.76 0.64 0.51 0.51 0.42 0.42 0.42 0.42 0.42 0.42
130 1.32 0.76 0.64 0.51 0.44 0.42 0.42 0.42 0.37 0.37 0.37
140 1.32 0.76 0.64 0.51 0.44 0.42 0.42 0.42 0.37 0.37 0.37
150 1.1 0.76 0.64 0.51 0.42 0.42 0.42 0.37 0.36 0.36 0.36
185 1.1 0.76 0.64 0.51 0.42 0.42 0.42 0.37 0.36 0.36 0.36

C0 Value N H W q L/R Q (L/S) V(m/s)

4.3 1 25 30 10 0.27272727 #REF! #REF!
3
3

Damper, Opposed Blades ,at duct extremity .

C0 Values

Width
Height
 20 30 40 50 60 70 80 90 100 105 120
15 12.81 12.81 7.23 7.23 6.07 6.07 5.57 5.57 5.57 5.25 5.25
20 7.23 5.25 5.25 3.35 3.35 3.35 3.35 2.48 2.48 2.48 2.48
30 5.25 3.35 2.48 1.96 1.96 1.62 1.62 1.62 1.62 1.62 1.62
40 3.35 1.96 1.62 1.3 1.3 1.07 1.07 1.07 1.07 0.92 0.92
50 3.35 1.96 1.62 1.3 1.3 1.07 1.07 1.07 1.07 1.07 1.07
60 2.48 1.62 1.3 1.07 0.92 0.9 0.9 0.9 0.9 0.9 0.9
70 2.48 1.62 1.3 1.07 0.9 0.9 0.9 0.9 0.9 0.9 0.9
80 2.48 1.3 1.07 0.9 0.9 0.9 0.9 0.75 0.75 0.75 0.75
90 1.96 1.3 0.9 0.9 0.75 0.75 0.75 0.66 0.66 0.66 0.66
100 1.96 1.3 0.9 0.9 0.75 0.75 0.75 0.66 0.66 0.63 0.63
110 1.96 1.07 0.9 0.9 0.75 0.75 0.66 0.63 0.63 0.63 0.63
120 1.96 1.07 0.9 0.75 0.75 0.66 0.63 0.63 0.63 0.63 0.63
130 1.96 1.07 0.9 0.75 0.66 0.63 0.63 0.63 0.48 0.48 0.48
140 1.96 1.07 0.9 0.75 0.66 0.63 0.63 0.63 0.63 0.48 0.48
150 1.62 1.07 0.9 0.75 0.63 0.63 0.63 0.48 0.48 0.42 0.42
185 1.62 1.07 0.9 0.75 0.63 0.63 0.63 0.48 0.48 0.42 0.42

C0 Value N H W q L/R Q (L/S) V(m/s)

5.25 1 25 30 10 0.27272727 #REF! #REF!
3
3

Damper, Opposed Blades ,at plenum extremity .

C0 Values

Width
Height
20 30 40 50 60 70 80 90 100 105 120
15 15.45 15.45 8.35 8.35 7.03 7.03 6.49 6.49 6.49 6.15 6.15
 20 8.35 6.15 4.36 4.36 4.36 4.36 4.36 3.62 3.62 3.62 3.62
30 6.15 4.36 3.62 3.16 3.16 2.83 2.83 2.83 2.83 2.83 2.83
40 4.36 3.16 2.83 2.49 2.49 2.21 2.21 2.21 2.02 2.02 2.02
50 4.36 3.16 2.83 2.49 2.49 2.21 2.21 2.21 2.21 2.21 2.21
60 3.62 2.83 2.49 2.21 2.02 2 2 1.92 1.9 1.9 1.9
70 3.62 2.83 2.49 2.21 2 2 1.92 1.9 1.9 1.9 1.9
80 3.62 2.49 2.21 2 1.9 1.9 1.87 1.87 1.87 1.87 1.87
90 3.16 2.49 2 1.9 1.87 1.87 1.87 1.87 1.87 1.87 1.87
100 3.16 2.49 2 1.9 1.87 1.87 1.87 1.87 1.87 1.87 1.87
110 3.16 2.21 2 1.9 1.87 1.87 1.87 1.87 1.87 1.87 1.87
120 3.16 2.21 1.92 1.87 1.87 1.87 1.87 1.87 1.87 1.87 1.87
130 3.16 2.21 1.9 1.87 1.87 1.87 1.87 1.87 1.87 1.87 1.87
140 3.16 2.21 1.9 1.87 1.87 1.87 1.87 1.87 1.87 1.87 1.87
150 2.83 2.21 1.9 1.87 1.87 1.87 1.87 1.87 1.87 1.87 1.87
185 2.83 2.21 1.9 1.87 1.87 1.87 1.87 1.87 1.87 1.87 1.87

C0 Value N H W q L/R Q (L/S) V(m/s)

6.15 1 25 30 10 0.27272727 #REF! #REF!
3
3

CR3-6 Elbow, Mitered

C0 Values

H/W
q
0.25 0.5 0.75 1 1.5 2 3 4 5 6 8
20 0.08 0.08 0.08 0.07 0.07 0.07 0.06 0.06 0.05 0.05 0.05
30 0.18 0.17 0.17 0.16 0.15 0.15 0.13 0.13 0.12 0.12 0.11
 45 0.38 0.37 0.36 0.34 0.33 0.31 0.28 0.27 0.26 0.25 0.24
60 0.6 0.59 0.57 0.55 0.52 0.49 0.46 0.43 0.41 0.39 0.38
75 0.89 0.87 0.84 0.81 0.77 0.73 0.67 0.63 0.61 0.58 0.57
90 1.3 1.27 1.23 1.18 1.13 1.07 0.98 0.92 0.89 0.85 0.83

C0 Value H W q H/W Q (L/S) V(m/s)

1.13 0.3 0.2 90 1.5 #REF! #REF!
6
7

ER3-1 Elbow, 90 Degree, Variable Inlet/Outlet Area, Exhaust/Return Systems .

C0 Values
W1 / W0
H / W0
0.6 0.8 1 1.2 1.4 1.6 2
0.25 1.76 1.43 1.24 1.14 1.09 1.06 1.06
1 1.7 1.36 1.15 1.02 0.95 0.9 0.84
4 1.46 1.1 0.9 0.81 0.76 0.72 0.66
100 1.5 1.04 0.79 0.69 0.63 0.6 0.55

C0 Value H W0 W1 H / W0 W1 / W 0 Q (L/S) V(m/s)

0.95 0.25 0.2 0.3 1.25 1.5 24 0.4
3
6

ER4-1 Transition, Rectangular, Two Sides Parallel, Symetrical, Exhaust/Return Systems .

C0 Values

q
A0 / A1
180 150 120 90 60 45 30 20 15 10
 0.06 0.98 0.98 0.99 1 0.86 0.71 0.56 0.4 0.27 0.26
0.1 0.91 0.92 0.93 0.93 0.82 0.69 0.53 0.36 0.26 0.24
0.25 0.66 0.67 0.69 0.7 0.68 0.6 0.42 0.22 0.19 0.17
0.5 0.35 0.36 0.37 0.38 0.37 0.35 0.24 0.15 0.13 0.14
2 1.09 1.02 0.78 0.54 0.28 0.24 0.2 0.2 0.2 0.23
4 6.6 5.65 4.38 2.78 1.12 0.88 0.64 0.64 0.64 0.81
6 15.2 13 10.2 6.56 2.53 1.98 1.44 1.44 1.44 1.82
10 43.1 37.1 29.1 19.1 8.02 6.5 5 5 5 5.03

C0 Value H1 H0 W L q A0 / A1 Q (L/S) V(m/s)

#REF! 0.2 0.1 0.15 #REF! #REF! #REF! #REF! #REF!
#REF!
#REF!

ED7-1 Centrifugal Fan Located in Plenum or Cabinet .

C0 Values

L / D0 0.3 0.4 0.5 0.75

C0 Values 0.8 0.53 0.4 0.22

C0 Value L D0 L / D0 Q (L/S) V(m/s)

0.4 0.2 0.3 0.6667 200 2.83
3

CR3-17 Elbow, Z-Shaped .

Cp Values
 L/W
H/W
100 10 8 4 2 1.8 1.6 1.4 1.2 1 0.8 0.6 0.4 0
0.25 2.53 2.7 3.03 3.39 4.6 4.64 4.6 4.41 3.97 2.89 1.77 0.99 0.68 0
0.5 2.46 2.62 2.94 3.3 4.47 4.52 4.47 4.29 3.86 2.81 1.72 0.96 0.66 0
0.75 2.39 2.55 2.86 3.2 4.35 4.39 4.35 4.17 3.75 2.74 1.67 0.94 0.64 0
1 2.3 2.45 2.75 3.08 4.18 4.22 4.18 4.01 3.61 2.63 1.61 0.9 0.62 0
1.5 2.19 2.33 2.61 2.93 3.97 4.01 3.97 3.81 3.43 2.5 1.53 0.96 0.59 0
2 2.07 2.21 2.48 2.77 3.76 3.8 3.76 3.61 3.25 2.37 1.45 0.81 0.56 0
3 1.91 2.03 2.28 2.56 3.47 3.5 3.47 3.33 3 2.18 1.34 0.75 0.51 0
4 1.79 1.91 2.15 2.4 3.26 3.29 3.26 3.13 2.82 2.05 1.26 0.7 0.48 0
6 1.66 1.76 1.98 2.22 3.01 3.04 3.01 2.89 2.6 1.89 1.16 0.65 0.45 0
8 1.61 1.72 1.93 2.16 2.93 2.95 2.93 2.81 2.53 1.84 1.13 0.63 0.43 0

Reynolds N0. Correction Factor Kr

Re / 1000 10 20 30 40 60 80 100 140 500

Kr 1.4 1.26 1.19 1.14 1.09 1.06 1.04 1 1

C0 Value Cp Value H W L Re/1000 L/W H/W Q (L/S) V(m/s) De

3.91 3.76 0.2 0.1 0.15 127.03 1.50 2 24 1.2 8.1008
7 8
7

SR4-1 Transition, Rectangular, Two Sides Parallel, Symetrical, Supply Air Systems .
C0 Values

q
A0 / A1
180 150 120 90 60 45 30 20 15 10
0.1 0.43 0.37 0.29 0.19 0.08 0.07 0.05 0.05 0.05 0.05
0.17 0.42 0.36 0.28 0.18 0.07 0.05 0.04 0.04 0.04 0.05
 0.25 0.41 0.35 0.27 0.17 0.07 0.06 0.04 0.04 0.04 0.05
0.5 0.27 0.26 0.2 0.14 0.07 0.06 0.05 0.05 0.05 0.06
2 1.4 1.44 1.48 1.52 1.48 1.4 0.96 0.6 0.52 0.56
4 10.56 10.72 11.04 11.2 10.88 9.6 6.72 3.52 3.04 2.72
10 91 92 93 93 82 69 53 36 26 24
16 250.88 250.88 253.44 256 220.16 181.76 143.36 102.4 69.12 66.56

C0 Value H1 H0 W L q A0 / A1 Q (L/S) V(m/s)

0.05 0.2 0.1 0.15 0.5 22.62 0.5 24 1.2
8 0.5
5

CR6-1 Screen .
C0 Values
n
A1 / A0
0.3 0.35 0.4 0.45 0.5 0.55 0.6 0.65 0.7 0.75 0.8 0.9
0.2 155 102.5 75 55 41.25 31.5 24.25 18.75 14.5 11 8 3.5
0.3 68.89 45.56 33.33 24.44 18.33 14 10.78 8.33 6.44 4.89 3.56 1.56
0.4 38.75 25.63 18.75 13.75 10.31 7.88 6.06 4.69 3.63 2.75 2 0.88
0.5 24.8 16.4 12 8.8 6.6 5.04 3.88 3 2.32 1.76 1.28 0.56
0.6 17.22 11.39 8.33 6.11 4.58 3.5 2.69 2.08 1.61 1.22 0.89 0.39
0.7 12.65 8.37 6.12 4.49 3.37 2.57 1.98 1.53 1.18 0.9 0.65 0.29
0.8 9.69 6.4 4.69 3.44 2.58 1.97 1.52 1.17 0.91 0.69 0.5 0.22
0.9 7.65 5.06 3.7 2.72 2.04 1.56 1.2 0.93 0.72 0.54 0.4 0.17
1 6.2 4.1 3 2.2 1.65 1.26 0.97 0.75 0.58 0.44 0.32 0.14
1.2 4.31 2.85 2.08 1.53 1.15 0.88 0.67 0.36 0.4 0.31 0.22 0.1
1.4 3.16 2.09 1.53 1.12 0.84 0.64 0.49 0.38 0.3 0.22 0.16 0.07
1.6 2.42 1.6 1.17 0.86 0.64 0.49 0.38 0.29 0.23 0.17 0.13 0.05
1.8 1.91 1.27 0.93 0.68 0.51 0.39 0.3 0.23 0.18 0.14 0.1 0.04
 2 1.55 1.03 0.75 0.55 0.41 0.32 0.24 0.19 0.15 0.11 0.08 0.04
2.5 0.99 0.66 0.48 0.35 0.26 0.2 0.16 0.12 0.09 0.07 0.05 0.02
3 0.69 0.46 0.33 0.24 0.18 0.14 0.11 0.08 0.06 0.05 0.04 0.02
4 0.39 0.26 0.19 0.14 0.1 0.08 0.06 0.05 0.04 0.03 0.02 0.01
6 0.17 0.11 0.08 0.06 0.05 0.04 0.03 0.02 0.02 0.01 0.01 0

C0 Value H1 H0 W1 W0 n A1 / A0 Q (L/S) V(m/s)

4.58 0.2 0.1 0.15 0.5 0.50 0.6 24 1.2
6
6

Elbow 900, Smooth Radius without Vanes,Rectangular

CO =KJKReC'0

C0'
r/W H/W
0.25 0.5 0.75 1 1.5 2 3 4 5 6 8
2 0.2 0.18 0.16 0.15 0.14 0.13 0.13 0.14 0.14 0.15 0.15
1.5 0.22 0.2 0.19 0.17 0.15 0.14 0.14 0.15 0.16 0.17 0.17
1 0.27 0.25 0.23 0.21 0.19 0.18 0.18 0.19 0.2 0.27 0.21
0.75 0.57 0.52 0.48 0.44 0.4 0.39 0.39 0.4 0.42 0.43 0.44
0.5 1.3 1.3 1.2 1.2 1.1 1.1 0.98 0.92 0.89 0.85 0.83

Kre
r/W Re x 10-4

1 2 3 4 6 8 10 14 20
0.75 2 1.77 1.64 1.56 1.46 1.38 1.3 1.15 1
0.5 1.4 1.26 1.19 1.14 1.09 1.06 1.04 1 1

F 0 20 30 45 60 75 90 110 130 150 180

Kf 0 0.31 0.45 0.6 0.78 0.9 1 1.13 1.2 1.28 1.4
Diverging Tee, Pyramidal Main and Take-off With 450 Leading Edge.

Branch
Qb/Qc 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1
Cc,b 1.4 1.2 0.96 0.82 0.68 0.56 0.49 0.47 0.48 0.5 0.54

Main
Qs/Qc 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1
Cc,s 0.22 0.21 0.2 0.2 0.2 0.2 0.2 0.22 0.25 0.35 0.53

Elbow, Converging or Diverging Flow, Rectangular.

C'0

H0/W0 W1/W0
0.6 0.8 1.2 1.4 1.6 2
0.25 1.8 1.4 1.1 1.1 1.1 1.1
1 1.7 1.4 1 0.95 0.9 0.84
4 1.5 1.1 0.81 0.76 0.72 0.66
5 1.5 1 0.69 0.63 0.6 0.55

Re x 10-4 1 2 3 4 6 8 10 14 20
Kre 1.4 1.26 1.19 1.14 1.09 1.06 1.04 1 1

Pyramidal Diffuser, Rectangular