Chapter hvac engineering Fundamentals: Part 1 Introduction

20.5.2
Room criteria curves
Room criteria curves (Fig. 20.5) were introduced in the ASHRAE
Handbook in 1980. They provide guidance when a minimum level of
background sound is needed for masking or other purposes. According
to the Handbook, ‘‘the shape of the RC curve is a close approximation
to a well-balanced blandsounding spectrum.’’ Such a background, with
Engineering Fundamentals: Part 5
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