I read a lot about building your own air filtration unit from a box fan or furnace blower but I am still looking at manufactured one to get the extra features like timers, etc. I think that if build your own and buy 2 or more levels of filters and bags or electrostatic filters you are approaching the cost of a factory made one ( I maybe wrong?).
I would like to know if you have any experience with the Grizzly G0572 or G9956.
Do these have equal performance to the Jet or Penn?
What are the critical performance criteria to look for?