So just spent 20 min of my life looking for threads about discussion of a pre filter and did not find what I was looking for so I will just ask.
It seems as if the exhaust fan is a weak link to early break down. Is there not a way to add a thin and breathable filter before the fan air flow just to filter some of those particles that cake the blades and cause issues? Would not have to be much but even something that has a slot to slide it in and out of to wash or to change out.
I don’t know maybe I am just babbling and has already been addressed but I thought that I would try to get a answer.