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.