Multiflow SMB450 4 3AC Inline Flow Box Fan Three Phase AC 450mm

The Elta Multiflow SMB450/4-3AC is a 450mm square inline mixed flow box fan with a three phase AC motor, moving up to 3920 m³/h in free air and still delivering 533 m³/h against 300 Pa. It fits straight into 450mm ductwork on Ductmate flanges at each end.The 4 pole motor runs at 1375 rpm on a 380 to 415V 50Hz supply, absorbing 0.378 kW with a peak current of 0.88 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 3920 m³/h Speed Controllable What it is best used forMedium sized commercial extract and supply on a three phase supply with 450mm ductwork: restaurant and commercial kitchen extract (behind a filtered canopy), lift motor rooms, plant rooms, warehouse offices and general HVAC. It holds 3290 m³/h at 100 Pa and 2578 m³/h at 200 Pa, so it copes with a run that includes a silencer and several fittings.Its curve falls away sharply after 250 Pa (533 m³/h at 300 Pa), so for high resistance systems or anything over about 4000 m³/h choose the SMB550/4-3AC instead.Why choose this over alternativesAgainst the single phase SMB450, the three phase SMB450/4-3AC moves a little more air (3920 against 3830 m³/h at 0 Pa) and draws 0.88 A per phase at 400V instead of 2.05 A on a single phase supply. Against the SMB400/4-3AC, it adds about 1400 m³/h and goes on to 300 Pa where the 400 stops at 200 Pa.The SMB500/4-3AC has almost identical performance with a 500mm connection, so pick between them on duct size.Installation notes Mount the fan at any angle in the duct, securely supported, and leave access for maintenance. It weighs 23 kg. Connect with the 450mm Ductmate flanges at each end. Elta's 450mm flexible connectors (063-0450-MFB) and anti vibration mounts (062-002) 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-TC33 three phase transformer speed controller (3 A), available to order, ask us. Elta 450mm splitter silencer 068-0450-MFB, available to order, ask us. Elta 450mm flexible connectors 063-0450-MFB (each), available to order, ask us. Elta anti vibration mounts 062-002 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 SMB450/4-3AC Type Square inline mixed flow box fan Duct size 450mm (Ductmate flanges) Max airflow 3920 m³/h Static pressure 300 Pa Motor Three phase AC, 380 to 415V 50Hz, 4 pole, 1375 rpm Power 0.378 kW (0.88 A peak) Noise 42 dB(A) inlet, 46 dB(A) outlet at 3m Max air temperature 60°C Warranty 1 Year Manufacturer Airflow at 100 Pa 3290 m³/h Overall efficiency 39.5% at best efficiency point SFP at free air 0.33 W/(L/s) Dimensions 490 x 490mm overall, 400mm long Fixing holes 4 x 9mm on 472mm centres, 20mm flange Weight 23 kg Impeller Composite, 7 backward curved aerofoil blades Casing Pre-galvanised sheet steel Speed controller 149-TC33 (5 step transformer) Wiring diagram 152-106A Manuals & Guides Elta Multiflow SMB Datasheet Elta Multiflow SMB Installation Manual