The Elta STDL500-1EC‑R is a 500mm twin centrifugal box fan designed to deliver efficient and quiet ventilation. It is part of a range that includes seven standard sizes from 125mm to 500mm. This model provides airflow rates up to 1.740 m³/s and static pressures of up to 730 Pa. Suitable for operating temperatures up to +60°C, the fan features a redesigned casing that improves airflow performance and lowers specific fan power. It comes equipped with a built-in auto changeover panel for operational continuity and internal acoustic lining to minimize breakout noise. Optional spigot configurations allow for flexible installation. The STDL500-1EC‑R is ideal for energy-efficient ventilation in demanding environments.