WHAT DOES SECONDARY GLAZING MEAN?

Day-night time average amount, DNL or LDN: This measurement assesses the cumulative publicity to sound for a 24-hour interval (Leq around 24 hrs) with the 12 months, using a ten dB(A) penalty or weight extra to nighttime noise measurements supplied the amplified sensitivity to noise at nighttime.As well as a rapid research on the internet exposed