hi starting a new grow with bb fem, aurora indica, chronic, mazar, and sensi star fem. looks like there might be mold in the basement/ old house so i need to figure somethng out. on a low budget. also i need help with the ventilation. should i draw in air via dryer duct or expose of air out of the dryer duct. if i draw in the duct, then i can expose the air out of the "tent" into a air filter. would that be suitable? thanx for any help.