ABSTRACT
NR and NC Curves CHAPTER OUTLINE Noise Rating..............................................................................................................................219 Noise Criterion .........................................................................................................................220 NR Requirements and Recommendations .....................................................................221 NC Requirements and Recommendations..................................................................... 222
Noise rating (NR) curves and noise criterion (NC) curves are two sides of the
same coin, only with different origins; hence NR is used in Europe, whereas NC
is predominantly used in the North American countries.
