8
30
20
40
50
60
70
80
100
90
40
Total open nossles
50
60
75
100
125 150 175 200
225
250
275
300
325
350
375
400
450
500
550
q
a
[l/s]
Δ
p
t
[Pa]
5
6
7 8 9 10
15
20
25
30
40
50
60 70 80
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Service & maintenance Celo
Lindab reserves the right to make changes without prior notice
2021-04-15
Lindab reserves the right to make changes without prior notice
2021-04-15
2.2.2 Calculating the airflow
– After measuring the static nozzle pressure, calculate the air flow per nozzle:
q=0.0209 ∙ √P
q = air flow per nozzle
P = static nozzle pressure
– After finding the air flow per nozzle, find the needed number of open nozzles:
q
tot
/q=n
open
q
tot
= total air flow
n
open
= open nozzles
– Alternatively, read off the needed number of nozzles in the diagram below.
Diagram 1: Shows needed number of open nuzzles to reach a desired air flow at a
given pressure.
2.3 Changing the airflow
– Measure the static nozzle pressure
– Locate the air pressure/airflow diagram on the faceplate, or see diagram 1.
– Calculate the needed number of nozzles to be plugged, in order to reach the
desired airflow at the available air pressure.
– Plug or unplug nozzles to reach the desired air flow.
– Dividing the plugs evenly, will result in an even air spread.