The Stealth Ventilation 6” unit is popular for medium-sized grow tents with at least a 4x4ft base or greater. A wider inlet hole and internal impeller allow this model to tackle a high volume of air and still fit within your grow space harmoniously. The durable 6” model should be matched to a grow room of equal CFM, or ideally slightly less, to give growers flexibility with additional ventilation elements or adjusting canopy size. The overall CFM rating for your ventilation system should also consider the CFM rating of your carbon filter.