Noise Criterion (NC) Calculator for HVAC Systems

This Noise Criterion (NC) Calculator helps engineers and professionals assess indoor sound levels across various frequency bands to ensure comfort and meet building standards. Simply input the sound pressure levels (in decibels) for different frequency bands (63 Hz to 8000 Hz), and the calculator will determine the NC rating. Prefilled values are provided for standard NC ratings to serve as a reference for common environmental settings.

Noise Criteria is calculated by measuring the background noise is a building using a 1/1 octave spectrum and plotting the spectrum along with a set of curves, called NC Curves, ranging from 63 Hz to 8000 Hz

*Reference: AHRI STANDARD 885-2008

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