F-Gas Training and Certification: What You Need to Know
A complete guide to F-Gas training and certification — who needs it, what the qualification involves, and how to prepare for the City & Guilds 2079 assessment.
Contents:
Why F-Gas Training Matters
F-Gas training is not just a box-ticking exercise — it is a fundamental part of working responsibly in the refrigeration and air conditioning industry. Fluorinated greenhouse gases, while excellent refrigerants from a performance standpoint, have a significant impact on global warming when released into the atmosphere. Some common refrigerants have a Global Warming Potential (GWP) thousands of times greater than carbon dioxide.
Key point: Proper F-Gas training ensures that technicians understand both the environmental impact of the refrigerants they handle and the legal obligations that come with working on systems containing these substances.
The F-Gas rules exist to phase down the use of high-GWP refrigerants and to ensure that anyone handling these substances does so competently and safely. Without properly trained technicians, refrigerant leaks go undetected, systems are poorly maintained, and the environmental cost grows.
Who Needs F-Gas Certification?
If you carry out any of the following activities on equipment containing fluorinated greenhouse gases, you are legally required to hold an appropriate F-Gas qualification:
- Installation of refrigeration, air conditioning, or heat pump systems
- Maintenance and servicing of systems containing F-Gases
- Leak checking on equipment above certain charge thresholds
- Recovery of fluorinated refrigerants from systems
- Repair work that involves breaking into the refrigerant circuit
- Decommissioning of equipment at end of life
This applies across a wide range of sectors, from commercial refrigeration in supermarkets to domestic air conditioning installations and industrial process cooling.
Important: In Great Britain, companies working on stationary refrigeration, air-conditioning and heat-pump equipment operated by others normally need their own company certificate as well as qualified staff. That requirement does not apply in exactly the same way to every ownership and operator scenario.
Understanding the Legal Framework
The legal framework now needs to be read carefully by territory. In the EU, Regulation 2024/573 repealed 517/2014 and entered into force on 11 March 2024. In Great Britain, technicians still work under the retained UK F-Gas regime and related guidance. Across both systems, the core day-to-day duties are familiar:
- Prevent leakage and repair detected leaks without undue delay
- Carry out mandatory leak checks where thresholds are met
- Recover refrigerant during servicing, maintenance, and decommissioning
- Keep proper records
- Use appropriately certified people and, where required, certified companies
In Great Britain, these requirements are enforced through domestic legislation and guidance, and non-compliance can result in substantial penalties.
What F-Gas Training Covers
A thorough F-Gas training programme prepares you across all the core skill groups that the City and Guilds 2079 assessment examines. These include:
- Environmental regulations — Understanding the F-Gas Regulation, the Montreal Protocol, and the phase-down schedule for HFCs
- Thermodynamic principles — How refrigeration cycles work, the relationship between pressure and temperature, and properties of different refrigerants
- Refrigerant safety — Safe handling of refrigerants, understanding Safety Data Sheets, and the health risks associated with exposure
- Leak checking procedures — Direct and indirect methods, frequency requirements based on charge size, and record-keeping obligations
- Recovery and recycling — Proper techniques for recovering refrigerant from systems, including liquid and vapour recovery methods
- System components — Understanding compressors, condensers, evaporators, expansion devices, and control systems
- Brazing and pipework — Working with copper pipework, nitrogen purging during brazing, and pressure testing procedures
Exam tip: The City and Guilds 2079 theory paper tests your knowledge across all of these areas. Do not assume you can rely solely on practical experience — the questions require specific knowledge of regulation articles, GWP values, and procedural requirements.
The City and Guilds 2079 Assessment
City & Guilds 2079 is one widely used F-Gas qualification route in Great Britain. It is split into two main components:
Theory examination — A multiple-choice paper covering environmental legislation, refrigerant properties, system operation, safety procedures, and leak checking requirements. You need a solid understanding of both the regulatory framework and the technical fundamentals.
Practical assessment — Hands-on demonstration of competence, typically including tasks such as:
- Recovering refrigerant from a system using approved methods
- Carrying out a leak check using appropriate detection equipment
- Demonstrating safe handling and storage of refrigerant cylinders
- Performing a pressure/strength test and a tightness test on pipework
Both components must be passed to achieve the full qualification. The assessment is carried out at approved City and Guilds centres by qualified assessors.
Categories of F-Gas Certification
F-Gas certification is divided into categories based on the type of work you carry out:
| Category | Scope |
|---|---|
| Category I | Full scope — leak checking, recovery, installation, maintenance, and servicing of all systems |
| Category II | Installation, maintenance, servicing, leak checking, and recovery on systems containing less than 3 kg (or 6 kg for labelled hermetically sealed systems) of fluorinated greenhouse gases |
| Category III | Recovery of fluorinated greenhouse gases from equipment containing less than 3 kg |
| Category IV | Leak checking only, without breaking into the refrigeration circuit |
Most refrigeration and air conditioning engineers working in the field will need Category I certification, as it covers the full range of activities without charge-size restrictions.
Key point: Make sure you understand which category applies to your role before booking your assessment. If you are working on large commercial systems, Category I is essential.
Preparing for Your F-Gas Assessment
Effective preparation combines practical experience with focused study of the theory. Here are some tips from experienced engineers:
- Know the rules that apply where you work — In Great Britain that means the retained UK regime and current guidance; if you also work cross-border, be aware the EU now uses Regulation 2024/573
- Learn your refrigerants — Understand the GWP values of common refrigerants (R-410A, R-32, R-134a, R-404A, R-407C) and their safety classifications
- Practise calculations — CO₂ equivalent calculations come up regularly in the assessment. Know the formula: CO₂ equivalent = charge (kg) × GWP
- Understand leak checking thresholds — Systems containing 5 tonnes CO₂ equivalent or more require regular mandatory leak checks, with increased frequency at higher charge levels
- Review recovery procedures — Know the difference between liquid recovery and vapour recovery, and when each is appropriate
Do not underestimate the breadth of the theory paper. Many experienced technicians find the exam challenging because it tests regulatory knowledge that may not come up in day-to-day work.
How F-Gas Exam Prep Fits Into This
Whether you are approaching F-Gas certification for the first time or refreshing your knowledge before a reassessment, having a structured revision tool makes a real difference.
The F-Gas Exam Prep app is designed specifically for technicians preparing for the City and Guilds 2079 assessment. It includes:
- 460+ exam-style questions covering all skill groups, from environmental regulations and refrigerant properties through to system components and safety procedures
- Mock exams that mirror the real City and Guilds 2079 format, helping you get comfortable with the question style and time pressure before assessment day
- AI voice challenges for interactive revision — a different way to test your knowledge and reinforce key concepts
- Detailed explanations for every answer, so you understand why the correct answer is right, not just which one to pick
The app lets you focus on specific topic areas where you need the most practice, or take full mock papers to gauge your overall readiness. It is a practical companion to your hands-on training and an efficient way to maximise your study time.
Download F-Gas Exam Prep on iOS or Android and start revising today.
Start Practising Today
Download the F-Gas Exam Prep app and study with 460+ practice questions, mock exams, and detailed explanations.
