Dust Filter placement

Installing Dust Filter in ceiling today ! would like to know which end (direction) is appropriate to do best job. Shop is 8 x 15 with a garage door at one end and "IN-OUT" door on other. Most sawdust is made at the garage door end. I would assume that I should put the incoming filter end pointed at the most sawdust creating end but have read several different things about the circular flow and now now not sure. Toymaker

I have my ambient air cleaner centered on a long wall. This gives me a circular air flow. Seems to work well for me.
Bill