Multiflow SMB550 4 3AC Inline Flow Box Fan Three Phase AC 550mm

The Elta Multiflow SMB550/4-3AC is a 550mm square inline mixed flow box fan with a three phase AC motor, moving up to 7952 m³/h in free air and still delivering 914 m³/h against 500 Pa. It fits straight into 550mm ductwork on Ductmate flanges at each end.The 4 pole motor runs at 1385 rpm on a 380 to 415V 50Hz supply, absorbing 1.064 kW with a peak current of 2.33 A, and has sealed for life bearings. The casing is stiffened pre-galvanised sheet steel, the impeller has 7 backward curved aerofoil blades in high performance composite, and it handles air up to 60°C. Elta give a 12 month warranty. 3 Phase AC Motor Up to 7952 m³/h Speed Controllable What it is best used forLarger commercial systems on a three phase supply with 550mm ductwork: commercial kitchen canopy extract, restaurant and bar extract, larger plant rooms, lift motor rooms and general HVAC supply or extract in offices, schools and retail units. It holds 7243 m³/h at 100 Pa and 5386 m³/h at 300 Pa, so it handles longer runs with silencers and fittings.Above about 400 Pa the airflow drops quickly (914 m³/h at 500 Pa). For bigger volumes at those pressures, the SMB650/4-3AC keeps 3503 m³/h at 500 Pa. It is also a three phase fan only at this airflow: the single phase SMB550 moves far less air.Why choose this over alternativesAt 550mm the three phase model is a different class of fan from the single phase SMB550: 7952 m³/h in free air against around 5300 m³/h, and it reaches 500 Pa where the single phase version stops at 350 Pa. It draws 2.33 A per phase at 400V.Against the SMB500/4-3AC it roughly doubles the airflow for one size up in duct. If you are working close to the top of its curve, the SMB650/4-3AC gives more headroom.Installation notes Mount the fan at any angle in the duct, securely supported, and leave access for maintenance. It weighs 41 kg. Connect with the 550mm Ductmate flanges at each end. Elta's 550mm flexible connectors (063-0550-MFB) and anti vibration mounts (062-003) reduce transmitted noise and vibration. Wire to Elta diagram 152-106A: star connection for a 400V three phase supply. To reverse rotation swap any two incoming supply cables, and check rotation and airflow direction on first start. Fit a means of isolation, earth the fan, and protect the motor with a starter that has overload protection; fuses and breakers only give short circuit protection. Not for corrosive or explosive atmospheres. Inspect and clean the impeller and motor at least every 12 months. You'll also need Elta 149-TC310 three phase transformer speed controller (10 A), available to order, ask us. Elta 550mm splitter silencer 068-0550-MFB, available to order, ask us. Elta 550mm flexible connectors 063-0550-MFB (each), available to order, ask us. Elta anti vibration mounts 062-003 and mounting brackets 060-MFB-01, available to order, ask us. Browse more inline mixed flow fans, commercial box fans or Elta fans, or call us for help choosing the right fan.Specifications Model SMB550/4-3AC Type Square inline mixed flow box fan Duct size 550mm (Ductmate flanges) Max airflow 7952 m³/h Static pressure 500 Pa Motor Three phase AC, 380 to 415V 50Hz, 4 pole, 1385 rpm Power 1.064 kW (2.33 A peak) Noise 51 dB(A) inlet, 55 dB(A) outlet at 3m Max air temperature 60°C Warranty 1 Year Manufacturer Airflow at 100 Pa 7243 m³/h Overall efficiency 42.9% at best efficiency point SFP at free air 0.48 W/(L/s) Dimensions 617 x 617mm overall, 500mm long Fixing holes 4 x 11mm on 586mm centres, 35mm flange Weight 41 kg Impeller Composite, 7 backward curved aerofoil blades Casing Pre-galvanised sheet steel Speed controller 149-TC310 (5 step transformer) Wiring diagram 152-106A Manuals & Guides Elta Multiflow SMB Datasheet Elta Multiflow SMB Installation Manual