TR19 vs NAAD21: What's the Difference?
Two kitchen extract standards, how they relate, and which your insurer wants.
You may have seen both "TR19" and "NAAD21" mentioned in kitchen extract cleaning. They're related, not competing — and most professional cleans now reference both.
TR19
TR19 is published by BESA and is the long-established UK standard for the fire-risk management of grease in kitchen extract systems. It's the document most Cardiff insurers and fire-risk assessors reference. Read more in our TR19 guide.
NAAD21
NAAD21 (current version NAAD-21:2025) is published by NAADUK, the National Association of Air Duct Specialists. It covers similar ground with a slightly broader scope — Part 1 deals with grease in kitchen extract systems, Part 2 with indoor air quality in wider ventilation. It adds detail on grease-measurement methodology and photographic evidence.
Which one do I need?
In practice, the strongest position is documentation that references both. They overlap, and a clean carried out to TR19 standards with NAAD21-style measurement and evidence gives you the most robust record for insurance, fire-risk and EHO purposes. When you arrange a clean through us, the certification is designed to satisfy what your insurer asks for — get a free quote and we'll explain exactly what your records will contain.
Frequently Asked Questions
Does NAAD21 replace TR19?
No — they complement each other. Documentation referencing both gives the strongest compliance record.
Which do insurers ask for?
Most reference TR19, and increasingly NAAD21 alongside it. A clean documented to both covers you either way.
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