An USB Venturi desk fan ultra quiet
thingiverse
A Venturi desk fan ultra quiet if used with a good fan. I employed the following items: - Noctua NF-S12A ventilator for PC 120mm Fan - 2A DC-DC Step-up/Boost Converter R-Glable Booster DC-DC Step-Up Module Adapter - TOPK LED Magnetic USB Cable For iPhone 6/7/8 Plus 5s SE iPad Air Charger - 5PCS LOT Black Push Button Mini Switch 6A 10A 110V 250V KCD1-101 2Pin Snap-in - Bolts M3*12 The switch is discretionary. A USB magnetic cable suffices to turn on/off the fan. With the set-up boost voltage (12v - 18v), you can choose between silence and ventilation power. In my case, I chose silence. The set-up boost module is merely stuck (no screw, no glue).
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