11
10
40
30
20
20
40
50
10
Pressure drop in Pa
Air flow rate in m³/h
30
3 4
5 6 7
A
A
Number of unrestricted apertures
1.
Determine the number of apertures
from the diagram subject to the inten-
ded pressure drop and air flow rate.
Example:
The design provides the following
details for the part section:
■ Pressure drop: 20 Pa
■ Air flow rate: 27 m
3
/h
Number of apertures to be set: 6
2.
Set the number of apertures
A
at the
supply air aperture for setting into a
wall.
3.
Record the value in the commission-
ing report.
Commissioning, inspection, maintenance
Further details regarding the individual steps
(cont.)
5608 999 GB
