i have a question regarding the air vents on grow tents like the secret jardins, homebox, grolabs, etc. (just any popular grow tent in general). I notice most are good at keeping dust out but can they also filter out mold and bugs from your tent? Or is the only safe route a separate intake fan with a HEPA filer? How reliable are these grow tents and how good can they keep mold, pests out of the box?