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Notes on Boundary noise limits for ACMV systems in non industrial buildings (Feb 2018)

Date: October 04, 2019
To conduct noise assessments of ACMV (air conditioning and mechanical ventilation) systems under NEA's guideline for TOP submission, each test point is tested for a 15 minutes equipment "ON" and another 15 minutes "OFF" state. As it would take time to switch equipment on and off, each point usually take about 45 mins to test. That is assuming a one-take measurement, and external factors such as a sudden event of airplanes, mo...

Background noise correction factor for NEA noise limits

Date: 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 ...