Why this ducting earns its place
450 mm ducting is the heavy lifter of extraction systems. If your kitchen is running a bank of fryers, grills, and cooking stations simultaneously, the 350 or 400 mm sizes start to feel tight — you're fighting back-pressure and losing extraction power. At 450 mm, you've got the cross-section to move serious volume without strain.
At 3 kg per metre, it's heavier than smaller ducting, but still manageable on standard commercial mounting hardware. Aluminium gives you that lightness-to-strength ratio — it's strong enough to hold its shape under the load and thermal stress of continuous cooking extraction, but not so heavy that installation becomes a wrestling match. One-metre lengths mean you can build the height you need, segment by segment.
This is the size you choose when extraction matters as much as cooking. Busy takeaways, restaurant kitchens, institutional catering prep — anywhere the cooking load demands reliable airflow and you can't tolerate extraction bottlenecks. A 450 mm run steps up to the job; it's common to see kitchens with a smaller diameter (350 or 400 mm) at each appliance, merging into a 450 mm trunk line that carries everything to the exit.
