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WebFor example the effective distance of a 100dB(A)@1 metre sounder in an ambient noise of 65dB(A) is the distance at which the sounder output level reduces to 70 dB(A) i.e. 100 dB – 30 dB = 70dB. From the above table (and using the inverse square rule) a reduction of 30 dB means the sounder has an effective 70dB distance of 32 metres. WebDECIBEL FIRE AND SECURITY LIMITED - Free company information from Companies House including registered office address, filing history, accounts, annual return, officers, … burunda creations
Decibel Fire & Security - Cheltenham GL50 3PQ …
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