MARS HYDRO 4 INCH INLINE DUCT FAN AND CARBON FILTER COMBO WITH SPEED CONTROLLER Air Purification Each ballast also comes with

Each ballast also comes with an 8-foot power cord with plug

The system draws cool air in from the bottom vents

sound-absorbing heavy gauge steel casing

Calcium and magnesium are two of the macro elements that are significant to plants' growth and development

The desiccant packs reduce RH down to 50% but won't absorb below that level

MARS HYDRO 4 INCH INLINE DUCT FAN AND CARBON FILTER COMBO WITH SPEED CONTROLLER Air Purification Each ballast also comes withWith a 4'' inline fan rated for 205CFM, an activated carbon filter with Australian charcoal, and a knob controller applied to allow easy switching and adjustment of the fan speed, the Mars Hydro 4 inch inline duct fan and carbon filter combo offers you everything you need to set up the ventilation in a grow tent. A good ventilation setup for grow tents measuring up to 3x3 feet. Package Includes: 4" Inline Duct Fan with a knob Speed Controller, 4"