Mars Hydro 4'' 6'' Inline Fan Vent System/ Carbon Filter for Grow Tent Kits
GROW TENT VENTILATION SYSTEM. If you don't feel it's a good fit, we'll help you work through it. Are you the Mars Hydro factory?. This will put the fan into pairing mode. 2025 Version Smart iFresh 4" 6" Grow Kits.