Buying a Second-Hand Extraction Canopy: Checklist and Risks

Written by the Cool Stream Ventilation team. Regulatory references in this guide were checked against HSE, GOV.UK and BESA sources on 13 November 2026. Standards and rules are revised from time to time, so always check the current edition before you rely on a figure.

Why people consider it

A second-hand canopy can look like an easy saving, especially when fitting out a new unit on a tight budget. Sometimes it is a sound choice, for example when taking over a kitchen that is similar to the previous one. But the price of the canopy is only part of the story, and the cost of rework, redesign or non-compliance can quickly outweigh the saving.

Check the canopy itself

• Condition: dents, corrosion, cracked welds or sagging panels.
• Cleanliness: heavy grease deposits are a fire load and hard to remove.
• Material: stainless steel, non-combustible, with smooth joints.
• Grease filters: present, complete and of a suitable type; see baffle filters.
• Collar and drip trays: undamaged and compatible with the duct.
• Dimensions: measured accurately, not assumed.

Check it against the new kitchen

HSE guidance in CAIS10 says the canopy hood should be a suitable size and have enough extraction to minimise fume spillage, with a hood for every appliance or other source of fumes and heat. A used canopy sized for a small line will spill fumes over a larger one. Equally, different appliances and cooking types need different airflows. A designer should calculate whether the canopy and the extract fan can do the job.

Check the rest of the system

A canopy does nothing without a fan, ductwork and make-up air. If the old fan is undersized, the duct is greasy or there is no make-up air, a good canopy will still underperform. Where gas appliances are used, an interlock must be in place and tested.

A quick decision rule

If the new cooking line matches the old one, the canopy is sound and clean, the filters are intact and the extract and make-up air have been checked, reuse can be reasonable. If any of those is uncertain, treat the saving with suspicion. The cost of replacing an undersized canopy after the kitchen is fitted out, or of explaining to a council why the system does not match its design, is usually higher than the saving. When in doubt, ask for a survey and a written opinion before you buy.

When a new canopy is the better choice

Choose new when the cooking line is larger or different, when the old canopy is damaged or heavily greased, when you need a specific size or shape, when planning conditions require particular filtration, or when you want the canopy designed and commissioned as part of a documented system. We fabricate canopies to measure at our own works, and can also survey a second-hand canopy and tell you honestly whether it is worth reusing. See our extraction canopies and cost guide.

Frequently asked questions