### Strutt Help

NRC Rating

Strutt|Criteria|Ratings|Absorption|NRC calculates the Noise Reduction Coefficient (NRC) of the current row of the worksheet

NRC is calculated as:

NRC=(alpha_(250)+alpha_(500)+alpha_(1k)+alpha_(2k))/4

where:
alpha_(250,500,1k,2k) is the absorption coefficient in the 250 Hz, 500 Hz, 1 kHz and 2kHz octave bands, respectively.

Comments or suggestions to
strutt@arup.com