Description
The Elta Multiflow SMB is a square, duct-mounted mixed flow box fan whose innovative blade geometry delivers high airflow from a compact casing. Available in six standard sizes from 400mm to 700mm, it produces air volumes up to 4.07 m³/s and static pressures up to 796 Pa for demanding ventilation applications.
The fan uses backward-curved, aerofoil-section blades with three-dimensional geometry to discharge air diagonally, combining efficiency with quiet running. Its lightweight all-metal, pre-galvanised steel construction with Ductmate flanges eases installation, and single- or three-phase external rotor motors (thermal class 130 or 155) operate in ambient conditions up to +60°C, backed by a 12-month warranty.
Key specifications
- Sizes: 6 standard sizes, 400mm to 700mm
- Air volume: up to 4.07 m³/s
- Static pressure: up to 796 Pa
- Blades: backward-curved aerofoil section, three-dimensional geometry, diagonal discharge
- Motor: AC external rotor, single or three phase, thermal class 130 or 155
- Speed control: stepped transformer voltage controllers
- Casing: pre-galvanised sheet steel with Ductmate flanges
- Operating temperature: up to +60°C
- Warranty: 12 months
Delivery Information
Made to OrderThis item is made to order. Please allow 15-20 working days for delivery.
Delivery Options
| Service | Estimated Delivery | Cost |
|---|
| Standard Delivery (UK mainland) | Next working day from dispatch | £15.95 +VAT (£7.95 for small items) |
| Free Delivery | Next working day from dispatch | Free on orders over £400 ex VAT |
| Click & Collect | Collect from our Leicester branch | Free |
| Scottish Highlands & Islands | 2-3 working days from dispatch | £36.95 +VAT |
Delivery Area
We deliver to all UK mainland addresses. Scottish Highlands and Islands deliveries may take a little longer. We are not currently delivering to Northern Ireland — Click & Collect remains available.
Questions about delivery? Call us on 0116 246 0031 or email sales@alphaair.co.uk
Returns Policy
Six-Week Returns — No Restocking Fees
We want you to buy with confidence. You can return any standard stocked item within six weeks (42 days) of delivery for a full refund — 100% of the item price, no restocking or handling fees. Trade and business customers get exactly the same rights as retail customers. See our Returns Policy for full details.
Return Conditions
- Items must be unused and in original packaging
- Custom-made, bespoke or powder-coated items are made to your specification and cannot be returned unless faulty
- Items must be returned with proof of purchase
- Return shipping costs are the responsibility of the customer unless the item is faulty
How to Return
- Contact our customer service team to arrange a return
- Pack the item securely in its original packaging
- Include your order number and reason for return
- Ship the item to our returns address
Faulty Items
If you receive a faulty or damaged item, please let us know as soon as possible — ideally within 48 hours of delivery, so we can claim against the courier on your behalf. We will arrange a free collection and send a replacement or issue a full refund. This does not affect your statutory rights.
Questions? Contact us at sales@alphaair.co.uk
