There is a Pentz design cyclone on offer over in marketplace that is located in Melbourne and being offered at an exceptionally good price, IMO.

Bill Pentz steel cyclone with 4Hp 20" extractor, VFD, drum, gates, ducts & joiners.

Note 1: The impeller is actually 16" (not 20"), same as Clearview Max

Note 2: I have no connection to or financial interest in the sale