F-Gas Certification Explained
If you install, service or decommission equipment containing fluorinated refrigerants, F-Gas certification isn't optional. It sets who is legally allowed to touch the refrigerant circuit, and the category you hold determines exactly what work you can do.
F-Gas is the shorthand for the regulations governing fluorinated greenhouse gases — the refrigerants in most air conditioning and refrigeration equipment. Because these gases have a high global warming potential, the rules control who may handle them, how they must be recovered, and how leaks are prevented and recorded.
This guide explains what F-Gas certification is, the engineer qualification categories and what each one permits, why companies also need their own certificate, and the legal obligations that come with working on refrigerant systems. Where a precise threshold varies, treat the principle as the reliable part and check the current detail before you rely on a specific figure.
Key takeaways
- F-Gas certification is a legal requirement to handle fluorinated refrigerants — not just good practice.
- Engineer qualifications are split into categories (Cat 1–4); each defines the tasks you're permitted to do.
- Companies that employ certified engineers generally need a company certificate as well as the individuals.
- Core obligations include preventing leaks, recovering refrigerant properly and keeping records.
- Handling refrigerant without the right certification is unlawful and invalidates the paperwork.
What F-Gas certification is
F-Gas certification proves that a person is competent and legally authorised to work on equipment containing fluorinated refrigerants. It exists because these refrigerants are potent greenhouse gases: releasing them, or handling them badly, does real environmental harm, so the law restricts the work to certified people.
The certification covers the practical activities that touch the refrigerant circuit — leak checking, recovery, installation, servicing, maintenance and decommissioning — and the safe handling and containment of the refrigerant itself.
The engineer qualification categories
Individual engineer certification is divided into categories that reflect the scope of work each permits. In broad terms, Category 1 is the fullest — covering leak checking, recovery, installation, maintenance and servicing across the range of equipment. Category 2 covers similar activities but is limited by the refrigerant charge or the type of work. Categories 3 and 4 are narrower still: Category 3 typically covers recovery on smaller-charge systems, and Category 4 covers leak checking without breaking into the refrigerant circuit.
The principle to hold onto is that your category defines your permitted work. If a task involves an activity or a system outside the scope of the category you hold, you are not certified to do it — the level of certification, not your experience, is what the law goes by.
| Category | Broad scope |
|---|---|
| Cat 1 | Full scope: leak checking, recovery, installation, maintenance and servicing. |
| Cat 2 | Similar activities, limited by refrigerant charge or type of work. |
| Cat 3 | Recovery on smaller-charge systems. |
| Cat 4 | Leak checking only, without breaking into the refrigerant circuit. |
Company certificates
Individual certification isn't the whole picture. A business that carries out installation, maintenance, servicing or decommissioning of stationary refrigeration and air conditioning equipment generally needs its own company certificate, held alongside the certificates of the engineers it employs.
In practice that means the company demonstrates it employs enough suitably certified staff and has the procedures and equipment to do the work properly. The individual is certified to do the task; the company is certified to offer the service.
Legal obligations that come with it
Certification comes with duties. Refrigerant must be recovered rather than vented, leaks must be prevented and repaired, and equipment above certain charge thresholds must be leak-checked at a frequency that depends on its CO₂-equivalent charge. Records of interventions, refrigerant quantities and leak checks have to be kept.
Getting this wrong isn't a paperwork nuisance — deliberately releasing refrigerant is an offence, and work carried out without the correct certification is unlawful and undermines the validity of the records. Keep your certification current and log every intervention as you go.
Log every intervention as you work
F-Gas record-keeping is a legal obligation, not an afterthought. Capturing refrigerant quantities, leak checks and interventions against the job in TradePlanr keeps the compliance trail complete and to hand.
Frequently asked questions
Do I legally need F-Gas certification to work on air conditioning?
Yes. Handling fluorinated refrigerants — installing, servicing, recovering or decommissioning equipment that contains them — legally requires the appropriate F-Gas certification. Doing that work without it is unlawful.
What is the difference between the F-Gas categories?
The categories define the scope of permitted work. Category 1 is the fullest, covering leak checking, recovery, installation and servicing; Categories 2, 3 and 4 are progressively narrower, limited by charge, activity or type of work. Your category, not your experience, determines what you're allowed to do.
Does my company need an F-Gas certificate as well as me?
Generally yes. A business offering installation, maintenance, servicing or decommissioning of stationary refrigeration and air conditioning equipment usually needs a company certificate alongside the certificates of the engineers it employs.
What are my main F-Gas obligations on a job?
Prevent and repair leaks, recover refrigerant rather than vent it, leak-check equipment at the frequency its CO₂-equivalent charge requires, and keep records of interventions, refrigerant quantities and leak checks.
From guidance to action
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