FYI on RC2, they have a small division of their company that does EXHAUST filters for the mining industry! Their filters allow for the diesel engines on underground mining equipment to actually emit cleaner air from their exaust than is being sucked in on intake! There was a small 5min deal on this on the Discovery chanel where they were covering mining machines. They said that the mining company chose filtered diesel vehicles over electric for underground mining because they perform two functions, they act as a vehicle to do their main function, and their secondary function was air filtration. Diesel was chosen over gas because of some funky catalitic/amonia injection system that actually caused the exhaust the emit almost 0 CO2 as well (or some crazyness like that).
So RC2 has some good experience in all kinds of filtration.
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