Adding more:
Your comments about relocating made me think. I'm running a grow tent inside a moldy old closet (mold removed, but it's not exactly sterile). At this stage, I've been just leaving the tent open -- all the tent lighting works and it's not far along enough to need the air filter. So, I just added one more variable -- closed the tent and turned the filter on. This is really for odor, so the output is filtered, but the input comes from the non-mold side of a wall, so it might help if this is mold coming from the room.