The iFresh 4” Inline Duct Fan by Mars Hydro offers top-notch performance, delivering up to 205CFM of airflow while being as quiet as 26dBA, making it stand out from rival flagship models from competitors. The 4” fan features a USB controller that, when paired with the brand’s iFresh MarsPro Add-On Pack delivers a fully automated ventilation system that can adapt and optimize your grow space for the different growth stages. Mars Hydro’s 4” fan ensures top-tier performance at unmatched value, making it ideal for efficient, smart grow room ventilation control. The iFresh 4” Inline Duct Fan by Mars Hydro inline fan is suited for up to 100x100cm areas. Need more power? Consider the iFresh 6” Inline Duct Fan, which suits 150x150cm areas.