Initial adjustment of extraction

The air stream is initially adjusted by positioning a measuring probe at the back of the diffuser as shown. The pressure difference (Δpm) between the measuring probe and the room is measured. Using the adjustment table and the measurement, the correct setting can be found that gives the desired airflow. The diffuser cone must then be locked once the correct setting has been found.
URH100 (A)
Coefficient (k)
A |
-15 |
-12 |
-9 |
-6 |
-3 |
0 |
3 |
6 |
9 |
12 |
|
k |
0,43 |
0,63 |
0,83 |
1,02 |
1,22 |
1,42 |
1,65 |
1,88 |
2,11 |
2,33 |
|
URH125 (A)
coefficient (k)
A |
-15 |
-12 |
-9 |
-6 |
-3 |
0 |
3 |
6 |
9 |
12 |
15 |
k |
0,65 |
0,92 |
1,22 |
1,53 |
1,84 |
2,17 |
2,52 |
2,83 |
3,14 |
3,46 |
3,77 |
URH160 (A)
coefficient (k)
A |
-12 |
-9 |
-6 |
-3 |
0 |
3 |
6 |
9 |
12 |
15 |
18 |
k |
1,16 |
1,51 |
1,90 |
2,31 |
2,75 |
3,25 |
3,73 |
4,22 |
4,67 |
5,12 |
5,58 |
Airflow is calculated from the following: qv = k • √Δpm (l/s)