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Background noise correction factor for NEA noise limitsDate: September 23, 2019

Background Noise Correction Factor: 

The adjusted value for the maximum noise level shall be obtained by adding the correction factor corresponding to the difference between the maximum permitted level and the background noise level, set out in the Table below, to the higher of the 2 noise levels.

Difference between 2
noise 
levels in decibels (A)

Correction factor in decibels (A)
(a) Below 2 3
(b) 2 to less than 4 2
(c) 4 to less than 10 1
(d) 10 and above Nil

* Source: NEA's GUIDELINE ON BOUNDARY NOISE LIMIT FOR AIR CONDITIONING AND MECHANICAL VENTILATION SYSTEMS IN NON-INDUSTRIAL BUILDINGS;

CALCULATOR:

Background noise (dBA)Limit (dBA)CF (dB)Amb+CFLim+CFCorrected Limit
       

 

 

CF: Correction Factor

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