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It's very loud. The fan constructor is announcing 70db. I strongly recommend to chose a variable fan. I clearly made a mistake on this.
I'm using the laser cutting machine from a fablab so it's not intended for commercial use. I'm also in France, so it could cost you some money just for sending it. There is some online commercial services that might help. I know (but didn't test) https://www.sculpteo.com/en/ I'm pretty sure there is other companies alike. If you choose this solution, you may print on paper and cut it by hand first to be sure that you pieces are adjusting correctly.
I have very limited knoledge in electricity and none in electronics (I've just searched PWM). I guess the fan has an induction motor. It was featured with a control device (the black thing in the electrical box). Maybe it is controllable by PWM but it's far from my skills for now. Thank you for your concern.
I bought it on ebay from a british company : http://www.ebay.fr/itm/Centrifugal-industrial-extractor-fan-blower-1700-RPM-600-m3-h-230-V-/322237641871?hash=item4b06dc348f:g:YRQAAMXQNo5TWpqE
Air PurifierView Instructable »
The rules are in the wikipedia article in the link in the begining of the text.Here's a video about how to play : https://www.youtube.com/watch?v=G90o0ai57EM
Yut Nori GameView Instructable »
Swirl Pendant Lamp
Thank you everyone for your comments and advices.
Wall Led LampView Instructable »
Secret Phone Cradle (I made it at TechShop)
Multi-angle Laser Cut Phone Stand
thanks for your comments.
Flat Pack Solar Oven (200°+)
Voronoï LampView Instructable »
Super flexible double curvature surface - laser cut plywood
Wooden game points counterView Instructable »
Lamps Set for Objects Photography
Adesso-style floor lamp
Simple Elegant Paper Lantern/Lamp Easy!