I have the TP Tools blast cabinet... The bigger RED version they sell... I have their UPGRADED vac... not the one that comes with it... and a RECLAIMER in between. The reclaimer doesn't add to the clarity of the blast cabinet. It's there to allow the larger particles to drop out of the vac stream so you can reuse them. The fine dust goes into the vac.
I vented the vac exhaust OUTSIDE the shop. You can get silicosis from breathing this super fine dust. I had it vented inside the shop and noticed that I felt "dirty" after a blast session... so vented it outside - and bingo -- I can blast all day and not feel different or smell anything or see anything inside the shop.
This is the blast cabinet I have:
http://www.tptools.com/p/875,381_960...g-Cabinet.html
This is the VAC system I upgraded to:
http://www.tptools.com/p/39,15_176-D...Collector.html
This is the RECLAIMER in between the vac and the cabinet:
http://www.tptools.com/p/256,15_Stan...Reclaimer.html
NOTE THAT THE RECLAIMER IS COMPLETELY PASSIVE -- it does nothing except to allow the heavier sand to drop into a collection box.