I purchased the air filtration unit with my F1 Xtool with the assumption that is was going to filter smoke when engraving.  After just engraving a few small items my entire 2000 sq foot home smelled like smoke and I was coughing in the room where the engraving was taking place.  Everything seems to be working correctly, the filter comes on just before it starts to engrave and remains on for around 5 seconds after is complete.  The supposed filtered air is exiting the filer in the back.  I'm quite disappointed with this as it is right not.  Is this how this works?