Hon&Guan HF-P 6 Inch 312 CFM Inline Duct Fan Noise Level Quiet Sound

Want to hear how "quiet" the fan is? In this video, we display real noise level of HF-P 150P 6" fan.
The resting noise level of the room before the fan work is 42-46 dB. The fan itself emits 75-78 dB.
Then mounted the flexible ducting, the noise level for fan works with the ducting is 60-63 dB.
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