STDL500 3EC R Twinflow Centrifugal Box Fan Three Phase EC 500mm

The Elta STDL500-3EC-R is a Twinflow duty/standby centrifugal box fan for 500mm duct systems, with rectangular spigots sized 498 x 598mm. 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 6264 m³/h free air, about 5760 m³/h at 100 Pa, and still delivers 3373 m³/h against 500 Pa.Each fan has an IP44 EC external rotor motor (380 to 480V three phase, 50/60Hz) with sealed for life bearings, and the case is 1.2mm galvanised mild steel. An auto changeover panel (149-ACO3/BDV) 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. 3 Phase EC Motor Up to 6264 m³/h Speed Controllable What it is best used forThe biggest Twinflow in the range, on a 380 to 480V three phase supply: warehousing, factories, industrial units, large kitchens (general ventilation) and big office or college systems on 500mm ducting. It moves 6264 m³/h free air, about 5256 m³/h at 200 Pa and still 3373 m³/h at 500 Pa.It needs a three phase supply and 132 kg of structural support. If you only have single phase, the STDL500-1EC is the alternative, with about 1753 m³/h at 500 Pa. Not for corrosive, explosive or above +60°C air.Why choose this over alternativesThe point of a twin fan is resilience. A single fan such as the Elta SSDL500-3EC-R Singleflow moves more air in the same duct size (6552 m³/h free air against 6264 m³/h here, and 4320 m³/h at 500 Pa against 3373 m³/h), but when its motor fails the extract stops until someone replaces it. The STDL500-3EC-R keeps running on its standby fan, the panel gives a normally open fail contact 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 where a short outage is acceptable.This model has rectangular spigots (498 x 598mm). If your ductwork is round, the Elta STDL500-3EC is the same fan with 500mm circular spigots. The Elta STDL500-1EC-R is the single phase version of the same size, with 5508 m³/h free air.Installation notes Mount the fan horizontally only. Elta show it fixed directly to circular or rectangular duct, inverted, on AV mounts or hung from drop rods, and leave access for maintenance. Bring the 380 to 480V three phase, 50/60Hz supply to the terminals of the fitted auto changeover panel and provide a local means of isolation. Wiring diagram 152-720 applies. Set the maximum speed on the 149-CD-POT commissioning board. For external control from a potentiometer, the 149-POT-10-MI or a 0-10V BMS signal, remove the jumper and connect to terminals ST1; the board setting then caps the top speed. The panel's test jumper shortens the duty share switching time from 12 hours to 1 minute, so you can prove the changeover works at commissioning. Disconnect the EC fans before any insulation resistance testing. The electronics can be damaged and this is not covered by warranty. You'll also need Elta EC Electronic Controller 149-POT-10-MI for remote manual speed control. Elta AV mounts 062-SEL05 available to order, ask us. What's in the box Twin fan STDL unit Auto changeover panel 149-ACO3/BDV, fitted 149-CD-POT commissioning control, fitted Browse more commercial box fans, twin fans or Elta fans, or call us for help choosing the right fan.Specifications Model STDL500-3EC-R Type Twin fan duty/standby centrifugal box fan, EC Duct connection 498 x 598mm rectangular spigots Max airflow 6264 m³/h Static pressure 500 Pa Motor Twin EC, 3 phase 380-480V 50/60Hz, 1505 rpm Power 1.053 kW input at best efficiency, 1.40 A peak at 400V Noise 58 dB(A) inlet, 58 dB(A) outlet, 42 dB(A) breakout at 3m IP rating IP44 motors Warranty 1 Year Manufacturer Changeover control Auto changeover panel 149-ACO3/BDV, fitted Speed control 149-CD-POT commissioning potentiometer, 0-10V external input Airflow at 100 Pa 5760 m³/h Airflow at 200 Pa 5256 m³/h Overall efficiency 50.0% at best efficiency point Casing 1.2mm galvanised mild steel, acoustically lined Mounting Horizontal only Ambient temperature -20°C to +60°C, up to 90% RH Weight 132 kg Manuals & Guides Elta Twinflow STDL Datasheet Elta Twinflow STDL Installation Manual