while you are a small miner like me (10 th/s) i think you mean that you got fresh air from a fan with pipe 160 cm to your miningplace (upstairs in my home)

all i use is a canna-filter but i placed the canna-filter outside off my house and suck the fresh (and clean ) air out off the filter and blow this to my rig

this is a low-cost solution for small miners