Estimated Delivery: 2–5 Working Days
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View transport policyThe Elta SMB400/4‑1AC Inline Mixed Flow Box Fan – 400 mm is a high‑performance duct‑mounted ventilation fan engineered for commercial and industrial applications. Part of Elta’s Multiflow SMB range, this mixed‑flow box fan combines a rugged pre‑galvanised steel casing with a backward‑curved aerofoil impeller to deliver high volume airflow with excellent efficiency and reduced acoustic emissions. Designed for easy installation with Ductmate flange connections, and suitable for temperatures up to +60 °C, this single‑phase AC unit is ideal for HVAC extract and supply systems in workshops, factories, retail spaces, and large duct networks.
Casing: Pre‑galvanised sheet steel construction for strength and corrosion resistance.
Impeller: Backward‑curved aerofoil blades in a mixed‑flow design for high airflow and efficiency.
Motor: Single‑phase AC external rotor with sealed bearings for reliable operation.
Flange Connections: Ductmate flanges at each end for straightforward duct installation.
Operating Temp: Rated for operation up to +60 °C, suitable for general ventilation.
Product Type: Inline mixed flow box fan (Multiflow SMB series)
Model: SMB400/4‑1AC (Single‑Phase AC)
Fan Diameter: 400 mm
Motor Type: Single‑phase AC external rotor with sealed bearings
Casing Material: Pre‑galvanised steel
Impeller Type: Backward‑curved, aerofoil mixed‑flow blades
Flow Performance: High volume with efficient static pressure performance (model dependent)
Operating Temp: Up to +60 °C
Installation: Inline duct mounted with flanged ends for ease of connection
Applications: HVAC extract and supply, ventilation in workshops, industrial facilities, commercial buildings, and large duct systems
At Direct Duct Supplies, we are committed to delivering your orders quickly, safely, and efficiently. Below you will find our shipping procedures and policies. If you have any specific delivery deadlines or special requirements, please contact our team and we will do our best to assist.
We work hard to get our customers what they need when they need it. Below you will find information on our delivery service. If you have a particular need or deadline, please contact us and we’ll do our best to accommodate you.
Delivery Charges
Delivery charges vary depending on the size, weight, and value of your order. Shipping costs are calculated at checkout and clearly displayed on the My Basket page before you complete your purchase.
We offer a range of delivery options, including free delivery on selected orders, with standard delivery charges typically ranging between £20 and £40 depending on the service selected.
Delivery Time (UK)
We offer fast and reliable UK delivery, with most orders arriving within 2–5 working days from the date of purchase.
Smaller items typically arrive within 2–4 working days, while larger or heavier items may take 3–5 working days. Delivery times may vary slightly during busy periods or holidays.
Easy & Convenient Delivery
We use a combination of in-house logistics and trusted UK courier partners including Royal Mail, DPD and DX. This allows us to provide reliable delivery coverage across the UK. Once your order has been dispatched, you will receive an email confirmation with tracking details. You can also track your delivery via the My Account section.
Next Day Delivery
We offer next working day delivery on selected items and order types. Availability and pricing depend on the size, weight, and order value. Please contact us prior to ordering to confirm eligibility and we will do our best to arrange this.
International, Scottish Highlands, Islands & Northern Ireland
We are able to ship orders internationally, as well as to the Scottish Highlands and offshore locations. Please contact us for a delivery quote before placing your order.
Please note that some items may not be eligible for international shipping due to size or weight restrictions.
