use a charcoal box. Make a square box any size (depending on grow room), keep one side open ,and keep it big enough to fit a box fan. Put a pound or two of charcoal in a plastic tray of somekind inside. Drill 1 or 2 decent sized holes on the transverse side of the box for airflow, put papertowels over the keep charcoal fresh. Face your box fan towards the charcoal and let her rip.
Should freshen air within a day.
Check out the pic below.
ashighasucanget Reviewed by ashighasucanget on . how do i keep smell down hey all! Rating: 5