The Elta STDL500-3EC‑R is a 500mm twin centrifugal box fan featuring a 3‑phase EC motor for efficient and quiet ventilation. This model is part of a series of seven standard sizes ranging from 125mm to 500mm. It offers air volume flow rates up to 1.740 m³/s and static pressures up to 730 Pa. Designed for use in environments with temperatures up to +60°C, the fan incorporates a redesigned casing that optimizes airflow and lowers specific fan power consumption. It includes an auto changeover panel and is internally acoustically lined to minimize breakout noise. The fan also offers configurable spigot options to accommodate various installation requirements, ensuring reliable and energy-efficient performance.