The area of the wall to be calculated.
Resulting reduction number
The summed noise reduction number for the total wall.
Reduction number unit
The reduction number for a unit (Dn,e) is calculated on a 10m2 wall. An alternative value used is the R value for other standard wall areas. Correction figure for R value to D n, e depending on the wall area used to determine the value can be made according to the table below.
|Area ||10 ||2 ||1 ||m2|
|Correction ||0 ||7 ||10 ||dB|
Reduction number wall
The noise reduction value of the current wall.