The Elta STDL400-1EC is a 400mm twin centrifugal box fan engineered for energy-efficient and low-noise air movement. Part of a product series with seven standard sizes ranging from 125mm to 500mm, this model delivers airflow rates up to 1.740 m³/s and static pressures of up to 730 Pa. It is suitable for use in environments with temperatures up to +60°C. The fan features a redesigned casing that improves airflow efficiency and reduces specific fan power. An integrated auto changeover panel ensures seamless operation, while internal acoustic lining helps suppress breakout noise. Optional spigot types are available to suit various installation needs. The STDL400-1EC is ideal for applications requiring quiet, efficient, and reliable ventilation.