Multiflow SMB400 4 3AC Inline Flow Box Fan Three Phase AC 400mm

The Elta Multiflow SMB400/4-3AC is a 400mm square inline mixed flow box fan with a three phase AC motor, moving up to 2545 m³/h in free air and still delivering 1084 m³/h against 200 Pa. It fits straight into 400mm ductwork on Ductmate flanges at each end.The 4 pole motor runs at 1390 rpm on a 380 to 415V 50Hz supply, absorbing 0.208 kW with a peak current of 0.52 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 2545 m³/h Speed Controllable What it is best used forShort to medium duct runs on a three phase supply: plant room and lift motor room ventilation, toilet and changing area extract in offices and schools, small restaurant and cafe extract, and general HVAC supply or extract where the duct is 400mm. It keeps 2164 m³/h at 100 Pa, which suits a typical run of a few bends, a grille and a short length of duct.It runs out of pressure at 200 Pa (1084 m³/h there), so it is the wrong choice for long runs with heat exchangers, heavy filtration or attenuators. For that kind of system resistance step up to the SMB450/4-3AC, which still moves 2578 m³/h at 200 Pa.Why choose this over alternativesThe three phase SMB400/4-3AC and the single phase SMB400/4-1AC move almost the same air in free air (2545 against 2552 m³/h). The three phase motor draws only 0.52 A per phase at 400V against 1.09 A on the single phase model, which helps where several fans share a three phase distribution board. If a 230V supply is all you have, the single phase version is the better buy.The SMB's Ductmate flanged casing bolts straight into the duct run and can be mounted at any angle. If you need more pressure, the one size up SMB450/4-3AC reaches 300 Pa.Installation notes Mount the fan at any angle in the duct, securely supported, and leave access for maintenance. It weighs 16 kg. Connect with the 400mm Ductmate flanges at each end. Elta's 400mm flexible connectors (063-0400-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 400mm splitter silencer 068-0400-MFB, available to order, ask us. Elta 400mm flexible connectors 063-0400-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 SMB400/4-3AC Type Square inline mixed flow box fan Duct size 400mm (Ductmate flanges) Max airflow 2545 m³/h Static pressure 200 Pa Motor Three phase AC, 380 to 415V 50Hz, 4 pole, 1390 rpm Power 0.208 kW (0.52 A peak) Noise 46 dB(A) inlet, 50 dB(A) outlet at 3m Max air temperature 60°C Warranty 1 Year Manufacturer Airflow at 100 Pa 2164 m³/h Overall efficiency 37.5% at best efficiency point SFP at free air 0.29 W/(L/s) Dimensions 440 x 440mm overall, 300mm long Fixing holes 4 x 9mm on 422mm centres, 20mm flange Weight 16 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