Too powerful for an individual office use. as previous opinions: Misplaced and badly designed switch, position 1 last: not normal to go first by high speed .. Speed too high even at low speed, recurring problem in almost all the fans. But high-quality product because removable and therefore customizable: reversal of 1,2,3 contacts possible with great care. Cover cut to access the switch! And adding capacitor in series on the phase before switch 1μF / 400V (very slow) or 1.5μF / 400V (slow) and after it's perfect for me! .- Loss guarantee but perfect results !!!.