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TECHNICAL INFORMATION - VENT SILENCERS

Relative noise levels - What do dB levels mean in real life

SPL - dB(A) Description
0          = Threshold of hearing
10        = Empty recording studio
20        = Rustling leaves
30        = Library, night-time bedroom
40/50   = Living Room, surburban
60        = Conversational speech
70        = Noisy office
80        = Average surburban traffic
85        = City centre traffic
90        = Heavy truck
98        = Average Discotheque
105      = Aircraft noise on approach to landing
110      = Peak level at a very loud rock concert
120      = Pneumatic Drill - unsilenced
130      = Threshold of pain
140      = Large jet aircraft on take off at 40 metres
150      = Chest wall vibrates / giddiness

The smallest change in noise level that the human ear can hear is 1dB re 20 micro Pascal

 

EU Directive 2003/10/EC

What do these limitations mean for working times

Sound pressure level                     Maximum exposure in
dB(A)                                          any 24 Hour period
      80                                                24 Hours
      82                                                16    "
      85                                                8      "
      88                                                4      "
      91                                                2      "
      94                                                1      "
      97                                                30 minutes
     100                                               15       "
     103                                               7.5      "
     106                                               3.75    "

 

 

EU Directive 2003/10/EC

Are these the same levels than we are used to?

Probably not - in many European countries before this directive you didn’t need to take any action until noise levels reached 85 dB(A)

                                              New limits                        Previous limits

Exposure limit for                      200 Pa                            200 Pa
instantaneous noise

Upper exposure                         85 dB(A)                         90 dB(A)
action level

Lower exposure                         80 dB(A)                         85 dB(A)
action level


Contact us now with your requirements.

UK office:
Tel: +44 (0) 1494 770088
Fax: +44 (0) 1494 770099
Email: sales@flo-dyne.net


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Tel: +91 77 384 97 300
Email: sales-india@flo-dyne.net