Todd Fatheree wrote:

I'm not qualified to assess the technical merits, but what it says is that
you might be doing more harm by continuously circulating improperly-filtered
air and keeping it stirred up vs. letting it (eventually) settle to the
floor.

This is only a factor if it won't be stirred up anyways. I have a
poorly-insulated garage shop, and keeping it warm in -40 weather
circulates the air pretty well...

Chris