
Multiflow SMB
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SMB
- 9 standard sizes from 350mm to 1000mm.
- Air volume flow rates of up to 7.88 m3/s.
- Static pressures of up to 600 Pa.
- Suitable for operating temperatures up to +50°C.
- Extensive stock range available.
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The Multiflow SMB is a range of square cased mixed flow fans with a unique adjustable pitch mixed flow impeller, ideally suited for installation within ductwork and suitable for extract or supply for a braod range of industrial, commercial and residential applications.
FEATURES & BENEFITSLearn more about individual features and benefits of our products. |
SPECIFICATIONThe Power Plus range of plate mounted axial fans as manufactured by Elta Fans Ltd. |
TECHNICAL INFORMATIONThe technical information available to you from ELTA Fans is exhaustive - Choose from either sound, performance and electrical or dimensional data for each and every product |
ACCESSORIESElta supply a full range of accessories for each of their products. |
COMPAREChoose up to three products to compare their features side-by-side. |
DOWNLOADSGet the full brochure, wiring diagrams and operation and maintenance instructions. |
Features & Benefits
Aerodynamic appeal
The inherent aerodynamic benefits of good mixed flow impeller design provides marked advantages over axial and centrifugal air performance characteristics.
Quality impeller design.
Aluminium spinnings and pressings in a natural finish, together with steel hubs which are suitably zinc plated and dynamically balanced to Grade G6.3 for maximum efficiency.
Installer friendly simplicity.
All motors are pre-wired to an integral IP55 terminal box so they are ready for customer installation.
Material strength.
Multiflow SMB mixed flow fans have a robust casing design for added strength and durability. Casings are manufactured in pre-galvanised sheet steel which is suitably stiffened, with all motor supports hot dipped galvanised to BS 729 after manufacture.
Distinctive
The unique design of Multiflow SMB fans enables the required performance to be attained from a smaller fan size than is normally achievable with typical conical style, fixed blade mixed flow fans.
Outstanding performance
Mixed flow “non stall” airflow properties and a non overloading absorbed power curve allow a wide range of operating performance to be achieved.

Specification
The Multiflow SMB range of squared cased mixed flow fans as manufactured by Elta Fans Ltd. 46 Third Avenue, Pensnett Trading Estate, Kingswinford, West Midlands, DY6 7US, UK. Tel: +44 (0) 1384 275800 - If you need more information - Contact us.
Casing
The all metal casing shall be manufactured using pre-galvanised sheet steel suitably stiffened.
Casings shall incorporate Ductmate flange connections at each end.
Motor supports shall be of steel sheet construction, hot dipped galvanised to BS729 after manufacture and shall have an aerodynamic profile.
Motors
Motors are to be foot mounted totally enclosed metric type to IP55, with sealed for life bearings, standard industrial paint finish and Class F insulation to EN 60034-5, suitable for operating temperatures of up to +50℃
Motors are to be wired via a weatherproofed cable to an IP55 protected terminal enclosure in the casing wall.
Impellers
Adjustable pitch mixed flow impellers shall be provided with the blade angles set to meet the required duty.
The impeller construction shall comprise of aluminium spinnings and pressings in natural finish, together with steel hub assemblies, suitably zinc plated.
Assembled impellers are to be dynamically balanced to Grade G6.3.
Quality Management
Units are to be designed and manufactured with procedures as defined in BS EN ISO 9001: 2008.
All SMB units are to be tested to ISO 5801:1997 (airside performance) and BS 848 Part 2: 1985 (sound performance).

Technical Information
Dimensional Data

| Product Code | Fan Dia. A | B | C | D | E | Ductmate Flange | Impeller Dia | Weight (kg) |
|---|---|---|---|---|---|---|---|---|
| SMB350 | 350 | 400 | 420 | 9 | 375 | 25 | 250 | 22 |
| SMB400 | 400 | 450 | 480 | 9 | 425 | 25 | 315 | 30 |
| SMB450 | 450 | 500 | 470 | 9 | 475 | 25 | 350 | 30 |
| SMB500 | 500 | 550 | 500 | 9 | 525 | 25 | 400 | 30 |
| SMB550 | 550 | 620 | 550 | 11 | 585 | 35 | 450 | 44 |
| SMB650 | 650 | 720 | 600 | 11 | 685 | 35 | 500 | 58 |
| SMB700 | 700 | 770 | 650 | 11 | 735 | 35 | 560 | 63 |
| SMB800 | 800 | 870 | 700 | 11 | 835 | 35 | 630 | 79 |
| SMB1000 | 1000 | 1070 | 800 | 11 | 1035 | 35 | 800 | 147 |
Performance & Electrical Data
SINGLE Phase - 220V-240V / 50Hz
| Product Code | Speed r/min | Airflow m3/s @ Static Pressure Pa. | Motor Electrical Data | A.V Mounts | Speed Control | dBA@3m | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
0 |
50 |
100 |
150 |
200 |
250 |
300 |
400 |
500 |
600 |
FLC Amps |
SC Amps |
Output Kw |
Electronic |
Transformer |
||||
| SMB350/4-5-2 | 1300 | 0.34 | 0.28 | 0.14 | 1.09 | 2.30 | 0.12 | S1G | EL31 | TC12 | 43 | |||||||
| SMB350/2-4-2 | 2750 | 0.66 | 0.63 | 0.60 | 0.58 | 0.54 | 0.50 | 0.46 | 0.36 | 0.21 | 0.08 | 2.55 | 7 | 0.37 | S1G | EL31 | TC14 | 60 |
| SMB400/4-5-2 | 1300 | 0.72 | 0.64 | 0.53 | 0.39 | 0.12 | 1.51 | 3.69 | 0.18 | S1G | EL31 | TC12 | 50 | |||||
| SMB400/2-3-2 | 2750 | 1.20 | 1.16 | 1.14 | 1.10 | 1.07 | 1.03 | 1 | 0.90 | 0.78 | 0.66 | 6.15 | 22.70 | 1 | S1G | - | TC112 | 68 |
| SMB450/4-5-2 | 1350 | 1.18 | 1.09 | 0.97 | 0.80 | 0.57 | 0.29 | 0.10 | 2.56 | 5.93 | 0.37 | S1G | EL31 | TC14 | 54 | |||
| SMB500/4-4-2 | 1350 | 1.60 | 1.48 | 1.36 | 1.24 | 1.08 | 0.88 | 0.60 | 0.05 | 3.70 | 11.90 | 0.55 | S1G | EL61 | TC18 | 58 | ||
| SMB550/4-4-2 | 1350 | 2.43 | 2.30 | 2.15 | 1.95 | 1.76 | 1.53 | 1.25 | 0.38 | 6.28 | 16.40 | 1 | S2B | EL101 | TC110 | 62 | ||
| SMB650/4-4-2 | 1350 | 2.93 | 2.81 | 2.72 | 2.60 | 2.46 | 2.30 | 2.11 | 1.60 | 0.70 | 0.05 | 10.10 | 25.90 | 1.50 | S2B | - | TC112 | 6 |
Sound levels are average spherical free field values at 50% peak pressure for comparative purposes only
THREE Phase - 380V-415V / 50Hz
| Product Code | Speed r/min | Airflowm3/s Static Pressure Pa. | Motor Electrical Data | A.V Mounts | Speed Contol | dBA@3m | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
0 |
50 |
100 |
150 |
200 |
250 |
300 |
400 |
500 |
600 |
IE1 FLC Amps |
IE2 FLC Amps |
SC Amps |
Output Kw |
Transformer |
||||
| SMB500/6-5-3 | 910 | 1.16 | 1.02 | 0.75 | 0.28 | 0.75 | N/A | 2.30 | 0.18 | S1G | TC33 | 50 | ||||||
| SMB500/4-5-3 | 1410 | 1.82 | 1.73 | 1.60 | 1.46 | 1.32 | 1.14 | 0.87 | 2 | 1.65 | 11.40 | 0.75 | S1G | TC33 | 58 | |||
| SMB550/6-5-3 | 920 | 1.63 | 1.49 | 1.27 | 0.88 | 0.13 | 1.27 | N/A | 4.70 | 0.37 | S2B | TC33 | 55 | |||||
| SMB550/4-5-3 | 1410 | 2.51 | 2.43 | 2.33 | 2.20 | 2.03 | 1.83 | 1.60 | 0.84 | 2.90 | 2.37 | 15.40 | 1.10 | S2B | TC33 | 62 | ||
| SMB650/6-5-3 | 920 | 2.20 | 2.05 | 1.84 | 1.52 | 1.02 | 0.36 | 1.77 | N/A | 6.60 | 0.55 | S2B | TC33 | 58 | ||||
| SMB650/4-4-3 | 1420 | 3.09 | 2.97 | 2.84 | 2.72 | 2.59 | 2.46 | 2.29 | 1.85 | 1.24 | 0.38 | 3.70 | 3.30 | 20.40 | 1.50 | S2B | - | 67 |
| SMB700/6-4-3 | 920 | 2.84 | 2.65 | 2.38 | 2.10 | 1.73 | 1.26 | 0.65 | 2.12 | 1.94 | 8.70 | 0.75 | S2B | TC35 | 59 | |||
| SMB700/4-5-3 | 1415 | 4.65 | 4.51 | 4.40 | 4.27 | 4.10 | 3.92 | 3.73 | 3.34 | 2.76 | 1.98 | 6.78 | 5.96 | 47.50 | 3 | S2B | - | 68 |
| SMB800/8-5-3 | 700 | 4 | 3 | 3 | 2 | 1 | 0 | 2 | N/A | 10.70 | 0.75 | S2B | - | 58 | ||||
| SMB800/6-4-3 | 940 | 4.35 | 4.17 | 3.98 | 3.75 | 3.47 | 3.13 | 2.64 | 0.87 | 4.30 | 3.80 | 22.30 | 1.50 | S2B | - | 64 | ||
| SMB1000/8-4-3 | 710 | 6.83 | 6.53 | 6.20 | 5.81 | 5.35 | 4.78 | 3.98 | 0.93 | 5.31 | N/A | 32.90 | 2.20 | S2G | - | 61 | ||
| SMB1000/6-3-3 | 940 | 7.88 | 7.68 | 7.46 | 7.24 | 6.99 | 6.73 | 6.43 | 5.74 | 4.78 | 3.21 | 8.95 | 8.71 | 47.50 | 4 | S2G | - | 6 |

Data - SINGLE Phase
Sound Data
SMB - SINGLE Phase
| Product Code | 63Hz | 125Hz | 250Hz | 500Hz | 1kHz | 2kHz | 4kHz | 8kHz | dBA@3m |
|---|---|---|---|---|---|---|---|---|---|
| SMB350/2-4-2 | 80 | 75 | 77 | 77 | 75 | 75 | 70 | 63 | 60 |
| SMB400/2-3-2 | 87 | 79 | 81 | 84 | 84 | 83 | 78 | 70 | 68 |
| SMB350/4-5-2 | 66 | 65 | 64 | 61 | 59 | 58 | 51 | 42 | 43 |
| SMB400/4-5-2 | 73 | 72 | 71 | 68 | 66 | 65 | 58 | 50 | 50 |
| SMB450/4-5-2 | 78 | 76 | 74 | 72 | 69 | 69 | 63 | 54 | 54 |
| SMB500/4-4-2 | 75 | 76 | 75 | 76 | 74 | 72 | 67 | 61 | 58 |
| SMB550/4-4-2 | 80 | 78 | 80 | 79 | 79 | 76 | 73 | 64 | 62 |
| SMB650/4-4-2 | 83 | 84 | 84 | 84 | 85 | 81 | 77 | 70 | 68 |
SMB - THREE Phase
| Product Code | 63Hz | 125Hz | 250Hz | 500Hz | 1kHz | 2kHz | 4kHz | 8kHz | dBA@3m |
|---|---|---|---|---|---|---|---|---|---|
| SMB500/4-5-3 | 75 | 76 | 75 | 76 | 74 | 72 | 67 | 61 | 58 |
| SMB550/4-5-3 | 80 | 78 | 80 | 79 | 79 | 76 | 73 | 64 | 62 |
| SMB650/4-4-3 | 82 | 83 | 83 | 83 | 84 | 80 | 76 | 69 | 67 |
| SMB700/4-5-3 | 85 | 81 | 85 | 84 | 85 | 81 | 78 | 70 | 68 |
| SMB500/6-5-3 | 66 | 68 | 64 | 69 | 69 | 59 | 55 | 46 | 50 |
| SMB550/6-5-3 | 74 | 76 | 73 | 74 | 73 | 67 | 62 | 54 | 55 |
| SMB650/6-5-3 | 78 | 79 | 78 | 75 | 75 | 71 | 67 | 59 | 58 |
| SMB700/6-4-3 | 80 | 79 | 79 | 78 | 75 | 71 | 67 | 59 | 59 |
| SMB800/6-4-3 | 82 | 80 | 76 | 81 | 75 | 70 | 62 | 54 | 60 |
| SMB1000/6-3-3 | 90 | 89 | 86 | 86 | 83 | 79 | 70 | 63 | 67 |
| SMB800/8-5-3 | 82 | 80 | 76 | 81 | 75 | 70 | 62 | 54 | 58 |
| SMB1000/8-4-3 | 80 | 82 | 81 | 78 | 74 | 71 | 64 | 56 | 6 |
Silencer Data - THREE Phase
| Product Code | dBA Attenuation | (Pa) |
|---|---|---|
| SMB350/4-5-2 | -18 | 5 |
| SMB350/2-4-2 | -21 | 8 |
| SMB400/4-5-2 | -18 | 6 |
| SMB400/2-3-2 | -23 | 22 |
| SMB450/4-5-2 | -19 | 9 |
| SMB500/4-4-2 | -22 | 10 |
| SMB550/4-4-2 | -20 | 18 |
| SMB650/4-4-2 | -20 | 14 |
| Product Code | dBA Attenuation | (Pa) |
|---|---|---|
| SMB500/6-5-3 | -23 | 7 |
| SMB500/4-5-3 | -22 | 19 |
| SMB550/6-5-3 | -18 | 9 |
| SMB550/4-5-3 | -20 | 24 |
| SMB650/6-5-3 | -19 | 9 |
| SMB650/4-4-3 | -20 | 16 |
| SMB700/6-4-3 | -18 | 10 |
| SMB700/4-5-3 | -20 | 32 |
| SMB800/8-5-3 | -20 | 5 |
| SMB800/6-4-3 | -22 | 11 |
| SMB1000/8-4-3 | -16 | 17 |
| SMB1000/6-3-3 | -18 | 25 |
Wiring Data
SINGLE Phase - 220V-240V / 50Hz
| Product Code | Wiring Diagram no. |
|---|---|
| SMB350/2-4-2 | 152-502 |
| SMB350/4-5-2 | 152-502 |
| SMB400/2-3-2 | 152-502 |
| SMB400/4-5-2 | 152-502 |
| SMB450/4-5-2 | 152-502 |
| SMB500/4-4-2 | 152-502 |
| SMB550/4-4-2 | 152-502 |
| SMB650/4-4-2 | 152-502 |
THREE Phase - 380V-415V / 50Hz
| Product Code | Wiring Diagram no. |
|---|---|
| SMB500/4-5-3 | 152-600 |
| SMB500/6-5-3 | 152-600 |
| SMB550/4-5-3 | 152-600 |
| SMB550/6-5-3 | 152-600 |
| SMB650/4-4-3 | 152-600 |
| SMB650/6-5-3 | 152-600 |
| SMB700/4-5-3 | 152-600 |
| SMB700/6-4-3 | 152-600 |
| SMB800/6-4-3 | 152-600 |
| SMB800/8-5-3 | 152-600 |
| SMB1000/6-3-3 | 152-601 |
| SMB1000/8-4-3 | 152-601 |
Accessories
Inverter: IP20
This rating means this unit has a protection level of two against solid-body ingress, and a protection level of zero against the ingress of water.
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Inverter: IP55
This rating means this unit has a protection level of five against solid-body ingress, and a protection level of five against the ingress of water.
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Av Mounts (Rubber)
Spring AV mounts - zinc plated steel, rubber insert and foot pad
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Flexible Connectors (063-MFB)
Provides easy flexible connection with any matched ducting
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Silencers (068-MFB)
Infill is glass tissue faced high density mineral wool
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