STDL500 1EC R Twinflow Centrifugal Box Fan Single Phase EC 500mm

The Elta STDL500-1EC-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 5508 m³/h free air, about 4968 m³/h at 100 Pa, and still delivers 1753 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 5508 m³/h Speed Controllable What it is best used forThe largest single phase STDL, for warehousing, industrial units, factories and large office or school systems on 500mm ducting where three phase is not available. It moves 5508 m³/h free air and about 4284 m³/h at 200 Pa.At 132 kg it needs proper structural support. If a three phase supply is available, the STDL500-3EC moves more air at every pressure, about 3373 m³/h at 500 Pa against 1753 m³/h here. 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 SSDL500-1EC-R Singleflow moves more air in the same duct size (5814 m³/h free air against 5508 m³/h here, and 2192 m³/h at 500 Pa against 1753 m³/h), but when its motor fails the extract stops until someone replaces it. The STDL500-1EC-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 where a short outage is acceptable.This model has rectangular spigots (498 x 598mm). If your ductwork is round, the Elta STDL500-1EC is the same fan with 500mm circular spigots. The Elta STDL500-3EC-R is the three phase version of the same size, with 6264 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 220 to 240V single phase, 50/60Hz supply to the terminals of the fitted auto changeover panel and provide a local means of isolation. Wiring diagram 152-717 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-ACO1/EDV, 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 STDL500-1EC-R Type Twin fan duty/standby centrifugal box fan, EC Duct connection 498 x 598mm rectangular spigots Max airflow 5508 m³/h Static pressure 500 Pa Motor Twin EC, 1 phase 220-240V 50/60Hz, 1305 rpm Power 0.715 kW input at best efficiency, 3.70 A peak Noise 54 dB(A) inlet, 55 dB(A) outlet, 38 dB(A) breakout at 3m IP rating IP44 motors Warranty 1 Year Manufacturer Changeover control Auto changeover panel 149-ACO1/EDV, fitted Speed control 149-CD-POT commissioning potentiometer, 0-10V external input Airflow at 100 Pa 4968 m³/h Airflow at 200 Pa 4284 m³/h Overall efficiency 47.0% 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