The Elta STDL400-1EC‑R is a 400mm twin centrifugal box fan designed for efficient and quiet airflow performance. Part of a range with seven standard sizes from 125mm to 500mm, this model achieves airflow rates up to 1.740 m³/s and static pressures of up to 730 Pa. Suitable for environments up to +60°C, it features a redesigned casing that enhances airflow and reduces specific fan power. The unit includes a built-in auto changeover panel for continuous operation and is internally lined with acoustic insulation to reduce noise emissions. With configurable spigot options, the STDL400-1EC‑R offers flexible installation and reliable, low-energy ventilation.