I ask a friend who installs heating and cooling for a used squirrel cage blower. Couple of day later he show up like a true friend with a blower in hand. He subscribed to the theory more is better and brought me a commercial blower. I had plan to make me a air-filtration system. A year later, I found the time this weekend. I thought before I went through the trouble of building a box, I need to make sure this blower even operational. So took an old power cord and wire it to the blower. When I plugged it to the wall plug, the blower roar to life, spewing a years worth of shop dust in to the air. Once I caught my breath, I was pleasantly surprise that the blower ran perfect. With no more excuses I drew up a air-filtration system in sketchup . So this weekend I finished! The box is 3/4 poplar I had left over from another job. On the in take of the box I install a frame to hold a two filters ( 24 X 24).With such a large blower I went with the larger filters. I built a hatch on the side to access the filters.On the out take side I installed another filter. (12×15). So the air is filtered through three filters. I hung the box from my ceiling with eye bolts and hard wired it to the house with a timer. So now as I head up stair from my shop my filter system runs for an hour clearing the air. The finish size is 25 1/2’’, high, 36” long and 24’’ wide.I put a like to my sketchup model. I ran the filter for about 30 today and the filter already had a brown tint to it. Better in the filter than my lungs!