Made-to-Order Ductwork, Manufactured in the UK
Smart Ventilation Systems Ltd manufactures and supplies galvanised steel rectangular, square and spiral ductwork to DW144 from our workshop in Knebworth, Hertfordshire. Every fitting is fabricated in-house to your exact dimensions and dispatched site-ready across the UK.
Configure any part online, get an instant price, and submit a quote — no account or phone call needed.
Rectangular Ductwork
Straight lengths, bends, reducers, transitions, plenums and all ancillary fittings. Custom sizes — including common profiles such as 400×200 duct — made to order to DW144.
Spiral (Circular) Ductwork
Spiral lengths, bends, equal tees, reducers and full range of circular fittings. Lower leakage, fast installation, ideal for exposed and industrial runs.
Why Smart Ventilation Systems?
- DW144 Compliant — every section meets or exceeds the UK industry standard
- In-house Fabrication — full quality control from raw sheet metal to finished duct
- Made to Order — your exact dimensions, no minimum order
- Site-Ready Dispatch — all duct ends sealed with blue protective film
- Oil-Based Mastic Sealed — all seams sealed as standard
- UK-Wide Delivery & Installation — supply-only or supply-and-install
- Best Price Guarantee — we'll beat any like-for-like quote
Based in Knebworth, Hertfordshire, we serve commercial, industrial and public sector projects across London, the Home Counties, and the rest of the UK.
Free Duct Calculator
Need to fit a round duct into a tight ceiling void? Try our free circular to rectangular duct calculator — convert circular duct to rectangular sizes in seconds, with velocity and pressure-loss checks built in.
Get an instant price or contact us to discuss your project. Call 07710 984 957 — Mon–Fri, 8am–5pm.