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| Parameter | Value | Notes | | :--- | :--- | :--- | | | 3.0 – 3.5 Sones | Perceived loudness at 3 ft distance | | Decibel Equivalent | ~45 dB(A) | Equivalent to a quiet library | | Frequency Range | 250 Hz – 4 kHz | Mid-range hum, not high-pitched whine | | Test Standard | AMCA 320-11 | Air Movement and Control Association standard |