Mars Hydro Ventilation Fans: Are Programmed With Powerful Energy Saving technology, High Efficiency Fan Blades Designed to promote the best Air Flow For Your Grow Rooms. Solve Air Delivery Problems Without Major System Rework or Expense. The Fans Maintain Peak Performance In High Static Pressure Environments. Ten Speeds from Silent to Powerful. With Timer and Alarm Warning. 4"/6" Size For Choosing.
4" / 6" Inline Ventilation Fan