If anybody needs an air filter for their shop Woodcraft has these for $300. It is three speed, 550, 750 and 1100 cfm. It also has a timer for auto shutoff. They also have a smaller version for around $160.

I have that one, too. I really like the timer (1, 2, or 3 hours) because I WILL forget to turn it off. 

I put it on one of my lighting circuits so when I turn the lights off it turns off also.

Nice setup! I have a smaller WEN version.

I built my own from scavenged parts so no real cost involved.  I has an 8" fan salvaged from a large computer cabinet and moves a lot of air.

 

I have both of my air cleaners plugged into the main light circuit in the shop. When I go to shop the older unit goes on But the Jet has to be turned on each time with its switch, Aligned on outer wall on either side of the shop . One blows forward and the other to the back so makes a circuitous route.