0,84
0,60
0,12
30
25
40
45
50
35
0,36
1
10
100
1
10
∆
P (Pa
)
V
eff
(m/s)
k
p
L
wA
[dB(A)]
2
3
4
5
6
7
8
9
400
500
750
1000
1500
750
2000
3000
0,10
1,00
1
10
A
L
(m
2
)
V
eff
(m/s)
Q (
m
3
/h
)
Technical data
SCFR-GD Diagram
Selection example:
For the given duct dimensions, we select a 1000 x 300 mm SCFR-GD damper.
We use the table on the previous page to find the following data:
A
L
= 0,25 m
2
k
p
= 0,56 k
dB(A)
= -2
The technical data to achieve a flow rate of 5500 m
3
/h is required. Referring to the diagram above using the this flow rate
and an area of 0,25 m
2
, we find a V
eff
of 6 m/s. With this speed and taking into account the value of k
p
we are given:
Differential pressure: 20 Pa
Noise level: 44 dB(A)
Applying L
wA
- dB(A) = 44 - 2 = 42 dB(A)
Series SF
27
