STDL150 1EC Twinflow Centrifugal Box Fan Single Phase EC 150mm

The Elta STDL150-1EC is a Twinflow duty/standby centrifugal box fan for 150mm 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 493 m³/h free air, about 436 m³/h at 100 Pa, and still delivers 148 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 493 m³/h Speed Controllable What it is best used forWashroom, changing room and toilet core extract where a stopped fan is not acceptable: school and college toilet blocks, hotel bathroom risers, gym changing rooms, small office kitchenettes and internal meeting rooms. It gives 493 m³/h free air and about 436 m³/h at 100 Pa on 150mm ducting.It shares its motor with the 125mm model, so it is not the fan for high resistance systems: at 300 Pa it delivers about 302 m³/h. For bigger toilet cores or long runs, step up to the 200mm model.Why choose this over alternativesThe point of a twin fan is resilience. A single fan such as the Elta SSDL150-1EC Singleflow moves more air in the same duct size (662 m³/h free air against 493 m³/h here, and 324 m³/h at 500 Pa against 148 m³/h), but when its motor fails the extract stops until someone replaces it. The STDL150-1EC 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 STDL150-1EC-R is the same fan with 148 x 198mm rectangular spigots, which saves a transition piece. For less air, the Elta STDL125-1EC gives 418 m³/h free air. For more, the Elta STDL200-1EC gives 1019 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 068-0150-JF1 to JF4 (300 to 1200mm long) and fast clamps 018-150-CLAMP available to order, ask us. Elta panel filter 018-0150-FILT-P and electric heater battery 018-CV15-27-1M 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 STDL150-1EC Type Twin fan duty/standby centrifugal box fan, EC Duct connection 150mm circular spigots Max airflow 493 m³/h Static pressure 500 Pa Motor Twin EC, 1 phase 220-240V 50/60Hz, 3565 rpm Power 0.108 kW input at best efficiency, 0.95 A peak Noise 58 dB(A) inlet, 59 dB(A) outlet, 42 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 436 m³/h Airflow at 200 Pa 374 m³/h Overall efficiency 28.5% 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 29 kg Manuals & Guides Elta Twinflow STDL Datasheet Elta Twinflow STDL Installation Manual