Planning
Transmission field
4
46 | 82
Building Technologies
009865_m_en_--
Fire Safety
2015-11-06
Construction
Additional damping
Damp bricks
around 10 dB
Coated plasterboard (double wall)
around 15 dB
Armored concrete
around 30 dB
Thick, damp brick wall
>40 dB
Sample calculation:
A radio gateway is fitted under an armored concrete ceiling. The partition walls are
made from concrete.
Radio gateway with radio links A, B, C
Path A:
5 m
Free space+armored concrete ceiling
≈
40 + 30 = 70 dB
Path B:
15 m
Free space+armored concrete concrete
wall
≈
67 + 30 + 6 = 103 dB
Path C:
10 m Free space+concrete wall
≈
57 + 6 = 63 dB
Result:
●
Paths A and C can be used.
●
The radio detector will not be reached with path B.
A
B
C