Are you able to access outside air via a hole in the floor or a air conditioning vent? I'll let you know my suggestions if your able to cut or have a hole in the floor.

Ga Grown!
GaGrown Reviewed by GaGrown on . need help with ven. system? any ideas or suggestions on how 2 make basic , but effictive ventilation system (for heat and smell) for a small closet grow. Rating: 5