The architectural, facility makes the housing environment more pleasant, while too much noise
coming from machinery room is detrimental to the workers physically and mentally. Therefore, more
sound insulation and sound proof policies are increasingly required. However, as the annoyance
caused by facility noise is influenced by various human listening characteristics as well as physical
characteristics such as sound pressure level, it requires subjective evaluation characteristics through
acoustic-psychological approach. For this purpose, the facility noise in the machinery room was actually
measured and analyzed in the field to understand physical characteristics, and the correlation
between physical evaluation value and psychological response value through listening test. Further,
this study aims at presenting the data to set the standards of ‘Just noticeable difference’ of the facility
noise together with reasonable evaluation with psychological reaction, through the grading of
facility noise using trend formula. In the result, 13 stages of physical properties were forecasted for
each evaluation method, together with ‘Just noticeable difference’ using the grading of architectural
facility noise.