Air Sampling Openings - Bosch FAS-420-TT Series Operation Manual

20 en | Technical specifications
Components of manual blowing-out systems
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.
Air sampling opening with aspiration reducing film sheet and
marking tape
Aspiration reducing clips
In areas susceptible to obstructions or icing, special, patented ASD aspiration clips with
flexible aspiration reductions are used (see figure below).
2020.04 | 6.1 | F.01U.029.275
1
2
B
A
3
1
4
4 2
2
5 6 4 3
Operation guide
Aspiration smoke detector LSN improved
A Blast air supply connection
B Pipe system connection
1 Three-way tap
2 25 mm aspiration pipe
Aspiration reducing clips
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
Bosch Sicherheitssysteme GmbH