Gekko 315mm MDF Acoustic Box Fan — 3,250 m³/hrGekko 315mm (12") MDF Acoustic Box Fan 3,250 m hr The slightly lower output sibling of the Gekko 4250 same 12" flange and same UK engineered acoustic construction, just tuned for 3,250 m hr rather than the full 4,250. For large tents where you want the quiet Gekko build but don't need the absolute top airflow rating. Why growers choose the Gekko 315 MDF 3250: 3,250 m hr airflow still serious extraction capacity, handles 1. 5m 2m tents with heavy