Estimated Delivery: 2–5 Working Days
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View transport policyThe Elta SMB550 Inline Mixed Flow Box Fan – 550 mm Single Phase AC is a high‑performance ventilation fan from Elta’s Multiflow SMB range, engineered for commercial and industrial HVAC systems. Built with a heavy‑duty pre‑galvanised steel casing and Ductmate flanged duct connections, this mixed‑flow box fan delivers powerful, efficient airflow with reduced acoustic noise. The backward‑curved aerofoil impeller ensures strong air movement and consistent performance. Powered by a reliable single‑phase AC external rotor motor, the SMB550 is ideal for supply or extract ventilation in large duct networks, factories, warehouses, and commercial buildings.
Casing: Pre‑galvanised sheet steel with flanged connections for easy duct mounting
Impeller: High‑efficiency backward‑curved mixed‑flow blades
Motor: Single‑phase AC external rotor motor with sealed bearings for durability
Operating Temp: Rated for operation up to +60 °C
Finish: Corrosion‑resistant protective coating
Product Type: Inline Mixed Flow Box Fan (Multiflow SMB series)
Model: SMB550 / 4‑1AC (Single‑Phase AC)
Fan Diameter: 550 mm
Casing Material: Pre‑galvanised steel with Ductmate flanges
Impeller Type: Backward‑curved aerofoil mixed‑flow blades
Motor Type: Single‑phase AC external rotor motor
Voltage: 230–240 V AC / 50 Hz
Operating Temperature: Up to +60 °C ambient air
Installation: Inline duct mounting with flange connections
Applications: HVAC supply/extract ventilation, industrial and commercial duct systems, warehouses, workshops, and large ventilation networks
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.
