J. Phil Thien's Projects

Hi folks, I am Bob Crane and I live in southern Ontario. I have a couple of design/engineering questions about Thein seperator design. All of the limited engineering skills that I have lead me to believe that there is some defineable relationsip between the diameter of the baffle chamber and the cfm rating of the air supply. Vacuums are slower yet more powerful that blowers. Does the air speed  affect the seperation efficiency and is there an engineering formula to follow if I know the cfm of my vacuum? My second question relates the thickness of the secondary baffle. I am building a "top hat" seperator and find myself wondering if I should use 19mm ply or 1/4" mdf. All feed back is welcome and thank you for allowing me to join.