Normalized sound insulation of an element Dn,e 

Définition and scope

Determination of airborne sound insulation of small building blocks of less than 1 m² area such as shutter boxes, vents, electrical conduits, ...

Windows and doors of small area should be evaluated by the sound reduction index R according to DIN EN ISO 10140-1 and 2.

The measurement shall be performed in a flanking transmission testing facility.

Evaluation method according to NF EN 10140-1 and 2

Expression of results: Calculation of weighted single index Dn, e, w (C, Ctr) according to DIN EN ISO 717-1

Values of Dn, e in third octave bands between 100 and 3150 Hz accounted for, accuracy of 1/10th of a dB.

Vertical displacement of a reference curve by 1 dB break until the sum of adverse deviations is the largest while remaining less than or equal to 32 dB.

Dn, e, w is the value given by while the reference curve at 500 Hz

The terms of adaptation to a spectrum (C and Ctr) are calculated using reference spectra.

Example Dn,e test result