we have filters, that solves the recirculating problem, it's the intake side that I don't know how to handle. I posted an answer where I'm growing a list of ide

we have filters, that solves the recirculating problem, it's the intake side that I don't know how to handle. I posted an answer where I'm growing a list of ideas and products out from. There's some interesting stuff in this space. The biggest unknown is how they perform in smoke conditions. They all assume standard pollen dust etc irritants in the air.