F-Gas leak check frequency calculator

RefrigerantSystem charge (kg)

A leak detection system is fittedHermetically sealed, and labelled as hermetically sealed

R290 and R744 (CO₂) are not F gases, so the F gas leak-check rules don't apply to them.

Where these numbers come from

Charge × GWP ÷ 1000 gives tonnes of CO₂ equivalent: gov.uk.
5 t, 50 t and 500 t — 12-monthly, 6-monthly, 3-monthly, doubled with a leak detection system; hermetically sealed and labelled under 10 t exempt: Article 4 (legislation.gov.uk) and gov.uk, Checking F gas equipment for leaks.
Leak detection from 500 t: Article 5 (legislation.gov.uk). Records: Article 6 (legislation.gov.uk).
GWPs: the refrigerant data in this app, IPCC Fourth Assessment Report (AR4) values — the basis of Annex I (legislation.gov.uk).
Rules checked 12 October 2026. Stationary refrigeration, air conditioning and heat pumps.