Very nice. I've got a small cart I built that holds 3x 12x24x2" filters with a small 4"x4" output squirrel cage fan. It doesn't move as much air as a box fan, but makes a fair wire wheel/power strop (buffer) stand. 

This summer I built one for a single 24"x24" which used a salvaged 3 speed blower from a dehumidifier. That one has a 6" duct outlet so I can use one of the portable AC vent mounts in the garage door as an exhaust (mostly for a spray painting or soldering fume extraction). 

One key I've found is to make sure you're running it before you start making dust and it keeps up much better. I also often run the fan on my furnace to help as well. I hate dust. I have a PSI dual fan ceiling mounted air cleaner too. I think those work more efficiently per CFM because of the air circulation, when properly installed

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