Remote control air filter

[woodbrains]

My simple question was is it not better to have an air flow in a downward direction rather than upwards.

Hello,

It makes little difference. The filter is NOT filtering the dust that comes off the machine, the primary sources of extraction are for that, and dust masks. The filter keeps the air in the room cleaner. Once the machine is turned off, the extractor cut out and the dust mask removed the air in the shop is cleaner to breathe, as the air filter should circulate the room air volume at least once every 10 minutes. They are even left on for a couple of hours after the occupant has gone home, to mop up all the floaty fine dust, so the air (and horizontal surfaces) is clean the next day.

Mike.