17
DN 125
10
60
50
40
30
20
20
40
50 60
80
100
10
Pressure drop
in Pa
Air flow rate in m³/h
0
5
-5
-10
A
10
30
70
90
Fig. 13
A
Valve cone setting in mm
1.
Determine the required valve cone setting from the
diagram (for DN 100 or DN 125), taking into
account the calculated pressure drop and air flow
rate for the individual section.
Example:
Engineering plans provide the following details for
the individual section:
■
Extract air valve for wall or ceiling installation:
DN 100
■
Pressure drop: 20 Pa
■
Air flow rate: 35 m
3
/h
Valve cone setting: 0 mm
2.
Select the determined valve cone setting
A
at the
extract air valve for setting into a wall or ceiling.
3.
Record the actual value in the commissioning
report.
Commissioning, inspection, maintenance
Metal ductwork (flat): presetting the…
(cont.)
5793 605 GB
