Bosch FAS-420-TP2 - Air Sampling Openings

20 en | Technical specifications Aspiration smoke detector LSN improved
2020.04 | 6.1 | F.01U.029.275 Operation guide Bosch Sicherheitssysteme GmbH
FAS-420-TM series
A
1
2
B
Components of manual blowing-out systems
A Blast air supply connection
B Pipe system connection
1 Three-way tap
2 25mm aspiration pipe
Aspiration reducing clips
3.6.2 Air sampling openings
Aspiration reducing film sheets
An air sampling opening is a 10mm bore in the aspiration pipe that is covered with a patented
aspiration reducing film sheet with the required opening diameter. The size of the opening
depends on the structure of the pipe system (see Planning).
The aspiration reducing film sheet is secured with marking tape to prevent it from becoming
displaced. The marking tape is a transparent sticky film with red edges and a 10 mm hole. It is
placed over the aspiration reducing film sheet so that the air sampling opening is not
concealed and can be seen from long distances.
1
3
36
2
4
4
45
2
Air sampling opening with aspiration reducing film sheet and
marking tape
1 Smoke aspiration pipe
2 Air sampling opening
with aspiration reducing
film sheet
3 Marking tape for
aspiration reducing film
sheet
4 Air sampling opening
5 Fire red (RAL3000)
6 Transparent
Aspiration reducing clips
In areas susceptible to obstructions or icing, special, patented ASD aspiration clips with
flexible aspiration reductions are used (see figure below).