STDL315 1EC Twinflow Centrifugal Box Fan Single Phase EC 315mm

The Elta STDL315-1EC is a Twinflow duty/standby centrifugal box fan for 315mm duct systems, with circular spigots. 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 2207 m³/h free air, about 1998 m³/h at 100 Pa, and still delivers 871 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 2207 m³/h Speed Controllable What it is best used forLarger commercial extract on 315mm ducting where the system must stay running: whole floor office toilet extract, commercial kitchen general ventilation (not the canopy), hotel and student accommodation risers, school dining halls and library ventilation. It gives 2207 m³/h free air and about 1750 m³/h at 200 Pa.At 61 kg and 759 x 866mm (A x B on the datasheet drawing) it needs a strong fixing and a decent void. It is not for grease laden canopy extract, corrosive or explosive atmospheres, or air above +60°C.Why choose this over alternativesThe point of a twin fan is resilience. A single fan such as the Elta SSDL315-1EC Singleflow moves more air in the same duct size (2376 m³/h free air against 2207 m³/h here, and 1008 m³/h at 500 Pa against 871 m³/h), but when its motor fails the extract stops until someone replaces it. The STDL315-1EC 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 circular spigots for standard circular ducting. If you are connecting to rectangular duct, the Elta STDL315-1EC-R is the same fan with 348 x 378mm rectangular spigots, which saves a transition piece. For less air, the Elta STDL250-1EC gives 1210 m³/h free air. For more, the Elta STDL400-1EC gives 4392 m³/h.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-SEL03 available to order, ask us. Elta spigot silencers 068-0315-JF1 to JF4 (300 to 1200mm long) and fast clamps 018-315-CLAMP available to order, ask us. Elta panel filter 018-0315-FILT-P and electric heater battery 018-CV31-30-1M or 018-CV31-45-1M or 018-CV31-90-3M 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 STDL315-1EC Type Twin fan duty/standby centrifugal box fan, EC Duct connection 315mm circular spigots Max airflow 2207 m³/h Static pressure 500 Pa Motor Twin EC, 1 phase 220-240V 50/60Hz, 2075 rpm Power 0.402 kW input at best efficiency, 1.74 A peak Noise 64 dB(A) inlet, 59 dB(A) outlet, 43 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 1998 m³/h Airflow at 200 Pa 1750 m³/h Overall efficiency 37.4% 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 61 kg Manuals & Guides Elta Twinflow STDL Datasheet Elta Twinflow STDL Installation Manual