THE DEFINITIVE GUIDE TO ENERGY EFFICIENCY

Working day-evening normal level, DNL or LDN: This measurement assesses the cumulative exposure to sound for a 24-hour period (Leq around 24 hrs) in the year, with a 10 dB(A) penalty or weight added to nighttime noise measurements offered the increased sensitivity to noise at nighttime.Moreover, window plastic wraps reduce any air leaks bordering