Bosch FAS-420-TT2 - Page 48

48 en | Planning Aspiration smoke detector LSN improved
2020.04 | 6.1 | F.01U.029.275 Operation guide Bosch Sicherheitssysteme GmbH
I-pipe system Air sampling
opening
Number of air sampling openings
2 3 4 5 6 7 8 9 10
E - - - 4.4 4.0 3.4 3.4 3.0 3.0
F - - - - 4.0 3.8 3.4 3.4 3.0
G - - - - - 3.8 3.8 3.4 3.4
H - - - - - - 3.8 3.8 3.4
I - - - - - - - 3.8 3.6
J - - - - - - - - 3.6
a
Punch diameter of the aspiration reducing film sheet
I-pipe system activation thresholds
Activation
thresholds
Number of openings 2 3 4 5 6 7 8 9 10
1 obstructed opening III III II I I — — — —
2 obstructed openings 0 0 III III II I I — —
3 obstructed openings 0 0 0 0 III III II I I
4 obstructed openings 0 0 0 0 0 0 III II I
5 obstructed openings 0 0 0 0 0 0 0 0 II
… will be recognized by the setting level x
— not possible, 0 not practical
Example
If 3 of a total of 7 air sampling openings are found to be obstructed, the switch for setting the
airflow monitoring should be set to level III.
Notice!
When planning in accordance with EN 54‑20 or ISO 7240-20, level I or II must always be set
for airflow monitoring.