Special Offer: Buy now  and get free Marspro add-on pack, limited time! Fan/Duct/Filter Size: 4 Inch Airflow: 205CFM Noise: 26.8dBA（measured under lab no-load conditions） Controller Type: Speed Controller & APP Smart Control* Filter: Refillable carbon filter

---

*Important Note: To enable App control features, the additional purchase of the 2026 iFresh MarsPro Add-On Pack (sold separately) is required. Click here to purchase>>

The 2026 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.