The Elta STDL250-1EC‑R is a 250mm twin centrifugal box fan built for energy-efficient and low-noise ventilation. It belongs to a range of seven standard sizes from 125mm to 500mm. This fan can deliver airflows up to 1.740 m³/s and static pressures reaching 730 Pa. Suitable for environments with temperatures up to +60°C, it features a redesigned casing that improves airflow efficiency and reduces specific fan power. The unit includes an integrated auto changeover panel and internal acoustic lining to reduce breakout noise. With configurable spigot options, the STDL250-1EC‑R offers flexibility in installation and consistent, high-performance air handling.