The method is based on a measurement of sound pressure levels and a set of sound pressure criteria curves ranging frequencies from 63 to 8000 Hz - and a tangent rating procedure. The criteria curves defines the limits of the octave band spectra that must not be exceeded to meet the occupants acceptance in the actual spaces.

NC-40 Information | NCDOR NC-40 Information | NCDOR

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Nc 40 - Fill Out and Sign Printable PDF Template | signNow Nc 40 - Fill Out and Sign Printable PDF Template | signNow

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