Mars Hydro iFresh 4" (100mm) Smart Inline Duct Fan (+iconnect / temp. sensor)

The 2025 Mars Hydro 4″ iFresh Inline Duct Fan delivers 205CFM airflow capacity, featuring an expansion port that enables app-based climate control when paired with the iFresh MarsPro Add-On Pack. This integration creates a fully automated ventilation system that intelligently monitors and optimizes your grow space environmental data,In Auto Mode, the fan runs at 25% by default and automatically switches to a set speed when the temperature or humidity reaches your trigger point—helping maintain a stable indoor temperature without the need for constant manual adjustment.