Any opinions welcome.
I had an old Dyson double cyclone vacuum for in the house.
Took it to pieces, mounted most of it on a large dustbin and put piping through the workshop.
Vent straight to the outside. The venting is clean, you cannot see the airstream. No matter how large or small the particles are that are sucked up, it all goes into the bin and stay there.
The suction is so strong that the walls of the bin needed to be reinforced.
The only thing I still need to do to it is fabricate a lifting mechanism so that I can remove the dustbin easily, as the cyclone and motor are fixed to the wall.