Cyclone design is done based on the size of the particle you wish to have settle out, and the CFM of the air flow. Designing a cone is not particularly difficult if you care to build your own, there are equations that specify the cone parameters for any given amount of filtration.

The Wikipedia has the heavy math, you can safely ignore, unless you want to study how the physics of the separation works.

Here is a link to a paper that has both the equations and the calculus. Read the first part . It explains in detail how they work, and what the tradeoffs are.

http://repository.tamu.edu/bitstream...AEN-Wang-1.pdf

I have seen other web pages with just the equations, but at the moment I cant find one. If you want something specific, build one. If it doesn't work well enough.. build another one! Usually much less expensive than buying one, I wish I had built mine, but I didn't have any special requirements. If I ever want another one, I will build it.


Hope that helps-

D