I’m somewhat intrigued by this propagation of sound waves using (what looks like) an ordinary fan but is the TRW - 17 - The Worlds first True Subwoofer. The blades of the fan change pitch (attitude) which controls the frequency of the sound waves (as illustrated in the animated sequence) and the fan rotates at a constant speed.

• The Specifications for this VERY low note sound device is:
• Amplifier Requirement: 200 watts @ 8 ohms
• Impedance: 8 ohms 0Hz - 40Hz
• Frequency Response: 1Hz – 30Hz +/- 4dB
• Suggested Crossover: 20Hz @ 18dB/octave
• Sensitivity: 94dB 1 watt 1 meter @10Hz
• Maximum Acoustic Output: >115dB between 1 and 20Hz.
• Distortion: Typically 3% or less between 1 and 30Hz @90dB Warranty – 3 years parts and labor Patent Pending

To give you an idea of how low 1Hz - 30Hz is: the lowest note “A” on the piano is 27.5 Hz, or twenty seven and a half vibration per second.
> Note names, MIDI numbers and frequencies - University of New South Wales Music Acoustics
> TRW - 17 - The Worlds first True Subwoofer, Eminent Technology