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Recommended NC The noise in different types of rooms should not exceed the Noise Criterion limits listed below:

Credit: Recommended Noise Criterion - NC. Available at: http://www.engineeringtoolbox.com/nc-noise-criterion-d_725.html. Accessed September 18, 2014.

NC - Noise Criterion

Air velocity at supply and return

When designing a NC rated room, the one detail that most often gets overlooked is the amount of noise generated from the HVAC systems within the rooms.The table right-hand lists supply and returns air velocities in feet per minute for airflow through unobstructed or free openings and their corresponding noise criteria ratings.
In auditoriums, theaters, and other critical listening spaces, the air velocities should below so that the signal-to-noise ratios will be high. The values in the table should be used as rough guidelines for design purposes only when specific data on registers and grilles are unavailable for the air distribution layout, airflow volumes, and pressure drop conditions being evaluated.
Credit: Noise Criteria for Rooms. Available at: http://www.acousticalsolutions.com/noise-criteria-for-rooms. Accessed September 18, 2014.

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