r/greenhouse

Hey everyone we grow micrgreens in clear outdoor greenhouse along our fencline recently built a 30' run 4' by 8' tall fits 11 racks what do you suggest to help with filtration of the air i have a fan on top that blows out and bottom that blows in on both side w other fans in the center. Wanted something that could provide eith possible air pressure so it can alway flush out the old particles or something that runs along the top with a vent that maybe can run 3 filters my question is with the humidity is there metal filters to help scrub the air without needing to be swapped weekly? Thank you guys starting 2 new markets and had a greenhouse fail need to fix this asap. Blessings to all who take the time.