Good evening, all. Can anyone explain positive and negative air pressure? I've been reading and reading here and other places trying to figure out why a can fan, 5 months old, would still allow odors to be detectable outside. u We sed an automatic spray air freshener in the room, too. Could that be the reson? We have tried about everything, watch the humidity ( I read somewhere they aren't effective above 50%? We've taped , caulked, plugged any perceivable air leak, and am about to freak. Oh, BTW, the strain is Master Kush from Nirvana. Also, the pre-filter has turned grey-does this mean the prefilter needs replacing, the whole thing needs replacing, or it's just from the occasional medicinal dose administered in the area? Appreciate all the effort and ideas!
tboner1 Reviewed by tboner1 on . Q:positive vs neg. air pressure Good evening, all. Can anyone explain positive and negative air pressure? I've been reading and reading here and other places trying to figure out why a can fan, 5 months old, would still allow odors to be detectable outside. u We sed an automatic spray air freshener in the room, too. Could that be the reson? We have tried about everything, watch the humidity ( I read somewhere they aren't effective above 50%? We've taped , caulked, plugged any perceivable air leak, and am about to freak. Rating: 5