Jetflow SJMF 250 Inline Flow Fan Single Phase EC 250mm

The Elta Jetflow SJMF250 is a 250mm inline mixed flow circular duct fan with a single phase EC motor, moving up to 1606 m³/h in free air and 1159 m³/h against 300 Pa. Its jet design double mixed flow impeller is driven directly by a brushless EC motor running at 3195 rpm, absorbing 0.172 kW at full speed.The IPX4 motor has sealed for life heavy duty NWB bearings and is rated for air up to 60°C. It arrives with a 1.5m mains lead and UK 3 pin plug (3A fuse) for fixed speed running, plus a detachable 5m jack lead for a potentiometer, 0-10V or PWM speed signal. Elta give a 24 month warranty. 1 Phase EC Motor Up to 1606 m³/h Speed Controllable What it is best used forLarger commercial systems on 250mm duct: restaurant dining areas, pub and bar ventilation, school halls, retail units and office floors, and supply or extract on general HVAC systems. It holds 1537 m³/h at 100 Pa and still moves 1159 m³/h at 300 Pa, which covers most ducted systems with a filter and attenuation.It is not a kitchen canopy grease extract fan and is not for corrosive or explosive atmospheres. For more than about 1600 m³/h, use the Elta SJMF315.Why choose this over alternativesWithin the Jetflow range, the SJMF250 sits between the SJMF200 (968 m³/h free air) and the SJMF315. It has the same plug-in EC design as its siblings, so the choice comes down to duct size and duty: at 100 Pa this size delivers 1537 m³/h for 0.172 kW.If the fan sits above an occupied ceiling, compare the SJMF250-S, which has an acoustic enclosure and is rated at 44 dB(A) at 3m against 55 dB(A) for this standard model, with almost the same airflow. The standard SJMF250 is shorter, lighter at 3.7 kg and lower cost, so it is the better buy where noise is not the deciding factor.Installation notes The fan can be mounted at any angle. Fix it securely to a solid surface and leave access for cleaning and maintenance. Sizes 150mm and above have a detachable mounting bracket. Connect to 250mm duct with Elta fast clamps (018-250-CLAMP) or flexible connectors so the fan can be removed later. Elta recommend silencers on the inlet and outlet in noise sensitive areas. Mains connection is by the fitted 1.5m lead and UK 3 pin plug with a 3A fuse. The fan is supplied for fixed speed; for speed control, remove the 3.5mm jack plug and connect the supplied jack cable to a 149-POT-10-MI, 0-10V or PWM signal (wiring diagram 152-553). Do not supply it through a timer or a regularly switched circuit: the EC motor has internal overload protection and may restart unexpectedly once it cools. Indoor use only, ambient -10°C to +60°C, not for corrosive or explosive atmospheres. Locate the discharge so exhaust cannot be drawn back through the open flue of a gas or solid fuel appliance, and inspect and clean the fan at least every 12 months. You'll also need Elta EC electronic controller 149-POT-10-MI, the potentiometer controller Elta list for this fan. Elta fast clamps 018-250-CLAMP (each) and backdraught damper 018-250-DAMPER, available to order, ask us. Elta spigot silencers 068-0250-JF1 (300mm) to 068-0250-JF4 (1200mm), available to order, ask us. What's in the box Jetflow fan with 1.5m mains lead and UK 3 pin plug Detachable 5m lead with 3.5mm jack for speed control Browse more inline mixed flow fans, inline duct fans or Elta fans, or call us for help choosing the right fan.Specifications Model SJMF250 Type Inline mixed flow circular duct fan Duct size 250mm Max airflow 1606 m³/h Static pressure 300 Pa Motor Single phase EC, 220 to 240V 50/60Hz, 3195 rpm Power 0.172 kW (1.3 A peak) Noise 55 dB(A) inlet, 56 dB(A) outlet at 3m IP rating IPX4 motor Warranty 2 Year Manufacturer Max air temperature 60°C Airflow at 100 Pa 1537 m³/h Airflow at 300 Pa 1159 m³/h Overall efficiency 64.6% at best efficiency point Weight 3.7 kg Impeller Jet design double mixed flow, direct drive Bearings Sealed for life heavy duty NWB Electrical connection 1.5m lead with UK 3 pin plug, 3A fuse Speed control 149-POT-10-MI, 0-10V or PWM via 5m jack lead Wiring diagram 152-553 Manuals & Guides Elta Jetflow SJMF Datasheet Elta Jetflow SJMF Installation Manual