SSDL250 1EC T Singleflow Centrifugal Box Fan Single Phase EC 250mm

The Elta SSDL250-1EC-T is a 250mm Singleflow SSDL centrifugal box fan with long circular inlet and outlet spigots and a pre-fitted terminal box. It moves up to 1307 m³/h in free air, 1022 m³/h at 200 Pa and still 428 m³/h at 500 Pa, the highest pressure in Elta's published table.A single phase EC external rotor motor (220-240V 50/60Hz) drives a backward curved impeller balanced to ISO1940-1, at up to 2545 rpm with an integrated commissioning control for setting speed. The 1.2mm galvanised steel casing is acoustically lined and suitable for external mounting, the IP44 motor has sealed for life bearings and runs in air from -20°C to +60°C, and Elta backs it with a 12 month warranty. 1 Phase EC Motor Up to 1307 m³/h Speed Controllable What it is best used forDucted extract or supply on 250mm duct where a little more volume than the 200 is needed: larger toilet blocks, classrooms, staff rooms, libraries and offices. At 100 Pa it moves 1184 m³/h, roughly 10 air changes an hour in a space of about 120 m³.Near 500 Pa the 250 gives no more air than the 200, so do not upsize for pressure alone. It is not suitable for corrosive or explosive atmospheres, and the airstream must stay within -20°C to +60°C.Why choose this over alternativesThis is the 250mm SSDL with circular spigots and terminal box. Pick this version for circular ductwork when you want a pre-fitted terminal box for a tidy, quick electrical connection and an easy disconnect point for maintenance. The fan, motor and performance are identical across the four versions, so the choice is only about duct shape and wiring. The same size is also available as Elta SSDL250-1EC (circular spigots), Elta SSDL250-1EC-R (rectangular spigots) and Elta SSDL250-1EC-RT (rectangular spigots with terminal box).Compared with the Elta SSDL200-1EC-T it gives about 15% more air at 100 Pa (1184 against 1026 m³/h) and the second lowest specific fan power in the range, 0.52 W/(L/s) at 100 Pa. For bigger duties the Elta SSDL315-1EC-T nearly doubles the volume, 2135 m³/h at 100 Pa.Installation notes Mount it at any angle, indoors or outside, on drop rods or Elta's SEL anti-vibration mounts (upright or inverted), make sure it is adequately supported, and leave access for maintenance. The long circular spigots take standard 250mm flexible or rigid circular duct directly; secure each joint with a clamp. A terminal box is pre-fitted to one side; tell us which side when ordering. Elta's drawing shows it adds 74mm to dimension B, so allow for that in tight voids. Speed is set on the built-in commissioning potentiometer. To use an external potentiometer or a 0-10V BMS signal, remove the jumper link and connect to ST1; the commissioning setting then caps the maximum speed. Disconnect the fan before any insulation resistance testing. Elta warn this can damage the EC electronics and is not covered by warranty. You'll also need Elta EC electronic controller 149-POT-10-MI (the potentiometer controller Elta list for every SSDL size) Elta anti-vibration mounts 062-SEL03 available to order, ask us Elta fast clamps 018-250-CLAMP and spigot silencers 068-0250-JF1 to JF4 (300 to 1200mm long) available to order, ask us Elta heater battery 018-CV25-30-1M and panel filter 018-0250-FILT-P for supply duties available to order, ask us Browse more commercial box fans, inline duct fans or Elta fans, or call us for help choosing the right fan.Specifications Model SSDL250-1EC-T Type Centrifugal box fan, circular spigots, terminal box Size 250mm circular spigots Max airflow 1307 m³/h Static pressure 500 Pa Motor Single phase EC, 220-240V 50/60Hz, 2545 rpm Power 167 W at best efficiency point (1.15 A peak) Noise 52 dB(A) inlet, 53 dB(A) outlet, 37 dB(A) breakout at 3m IP rating IP44 motor Warranty 1 Year Manufacturer Airflow at 100 Pa 1184 m³/h Airflow at 200 Pa 1022 m³/h Airflow at 500 Pa 428 m³/h Spigots 250mm circular inlet and outlet Electrical connection Pre-fitted terminal box Speed control Built-in commissioning potentiometer, 0-10V or external potentiometer input Overall efficiency 42.3% at best efficiency point SFP at 100 Pa 0.52 W/(L/s) Casing 1.2mm galvanised mild steel, acoustically lined Operating temperature -20°C to +60°C, up to 90% RH Weight 26 kg Wiring diagram 152-712 ErP Regulation (EU) 1253/2014, NRVU Manuals & Guides Elta Singleflow SSDL Datasheet Elta Singleflow SSDL Installation Manual