Elta STDL200-1EC-R Twinflow Centrifugal Box Fan Single Phase EC - 200mm (rectangular spigots)

The Elta STDL200-1EC-R is a Twinflow duty/standby centrifugal box fan for 200mm duct systems, with rectangular spigots sized 204 x 204mm. Two backward curved fans sit side by side in one acoustically lined case: one runs, the other waits on standby. At full speed it moves up to 1019 m³/h free air, about 896 m³/h at 100 Pa, and still delivers 367 m³/h against 500 Pa.Each fan has an IP44 EC external rotor motor (220 to 240V single phase, 50/60Hz) with sealed for life bearings, and the case is 1.2mm galvanised mild steel. An auto changeover panel (149-ACO1/EDV) is fitted as standard, switching to the standby fan if the duty fan fails and sharing run hours between the two. Speed is set by the built in commissioning potentiometer or a 0-10V signal, and Elta give a 12 month (1 year) manufacturer warranty. 1 Phase EC Motor Up to 1019 m³/h Speed Controllable What it is best used forMid size extract on 200mm ducting where continuity matters: multi cubicle toilet cores in offices and schools, classroom and library extract, hotel corridor and bathroom riser systems, and small kitchen general ventilation. It moves 1019 m³/h free air and about 763 m³/h against 200 Pa.It is mounted horizontally only and is rated for air up to +60°C, so it is not suitable for hot, grease laden kitchen canopy extract or corrosive or explosive atmospheres.Why choose this over alternativesThe point of a twin fan is resilience. A single fan such as the Elta SSDL200-1EC-R Singleflow moves more air in the same duct size (1148 m³/h free air against 1019 m³/h here, and 436 m³/h at 500 Pa against 367 m³/h), but when its motor fails the extract stops until someone replaces it. The STDL200-1EC-R keeps running on its standby fan, the panel gives normally open fail and run contacts for a BMS or alarm, and the duty share means neither motor does all the hours. Choose it for windowless toilets, risers and any system where a dead fan means a complaint or a breach of the ventilation design; choose the Singleflow w