[SML] Shop dust collection

[gbierly]

> As for air filtration, we have two large ceiling mounted "Airflow Systems" units.  They are switch activated, so they only help when one remembers to turn them on.  I am having the college electricians wire these so that they automatically activate when the table saw or radial arm saw are used.  A timer will shut them off after a specified period, with a manual override.  

I have our filter come on when the shop power disconnect is turned on.  We typically keep it turned off when the tools are not actively being used.  Works well for us.  It is also and auditory indicator that the shop power is on.

Greg Bierly