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IE F-Gas Category III study materials
IE F-Gas Category III study resources

IE F-Gas Category III practice questions

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Question 1F-Gas and ODS regulations

Under the F-Gas Regulation, which activity is a stationary refrigeration engineer holding a Category III certificate permitted to carry out?

  1. Commissioning large cascade systems
  2. Designing new HFC refrigeration circuits
  3. Certifying leak-tightness of hermetically sealed units
  4. Recovering refrigerant from a stationary refrigeration system Correct answer.

Explanation

Category III covers recovery of refrigerant from stationary refrigeration equipment and related containment activities. Design work and certification of equipment are outside the scope of the certificate.

Question 2F-Gas and ODS regulations

Which legislation in Great Britain sets out the requirement for fluorinated greenhouse gas handling certification for technicians?

  1. The Environmental Protection Act 1990
  2. The F-Gas Regulation Correct answer.
  3. The Ozone-Depleting Substances Regulations
  4. The Pressure Systems Safety Regulations

Explanation

The F-Gas Regulation establishes the certification and containment duties for handling fluorinated greenhouse gases. ODS rules cover ozone-depleting substances, not HFCs.

Question 3F-Gas and ODS regulations

A technician is about to work on a stationary refrigeration circuit containing R-404A. What must the technician hold before undertaking the work?

  1. A gas safety registration
  2. A waste carrier licence
  3. A building warrant
  4. A valid F-Gas handling certificate Correct answer.

Explanation

Work involving recovery or containment of fluorinated greenhouse gases requires an appropriate F-Gas certificate. Waste carrier licences and building warrants relate to other activities.

Question 4F-Gas and ODS regulations

What is the principal environmental concern that the F-Gas Regulation is designed to address?

  1. Acidification of surface water
  2. Emission of greenhouse gases with high global warming potential Correct answer.
  3. Formation of ground-level ozone
  4. Depletion of stratospheric ozone

Explanation

The F-Gas Regulation targets emissions of fluorinated greenhouse gases, many of which have very high global warming potentials. Ozone depletion is addressed separately under ODS rules.

Question 5F-Gas and ODS regulations

Which of the following is a controlled substance under the F-Gas Regulation?

  1. R-744 (carbon dioxide)
  2. R-718 (water)
  3. R-134a Correct answer.
  4. R-717 (ammonia)

Explanation

R-134a is an HFC and is a fluorinated greenhouse gas controlled by the F-Gas Regulation. Ammonia, carbon dioxide and water are natural refrigerants outside its scope.

Question 6F-Gas and ODS regulations

What does the global warming potential (GWP) of a refrigerant express?

  1. Its flammability relative to propane
  2. Its toxicity relative to carbon dioxide
  3. Its ozone-depleting effect relative to CFC-11
  4. Its climate impact relative to carbon dioxide over a set time horizon Correct answer.

Explanation

GWP expresses the climate impact of a gas relative to carbon dioxide over a defined time horizon, usually 100 years. Ozone depletion is expressed by ODP, not GWP.

Question 7F-Gas and ODS regulations

Which record must be kept when refrigerant is recovered from a stationary refrigeration system during service?

  1. A record of the ambient temperature during work
  2. A record of the quantity and type of refrigerant recovered Correct answer.
  3. A record of the customer's energy tariff
  4. A record of the technician's travel time

Explanation

Operators must keep records of refrigerant quantities and types handled, including recovered amounts. Records unrelated to refrigerant containment are not required by the Regulation.

Question 8F-Gas and ODS regulations

What is the purpose of a leak check on a stationary refrigeration system under the F-Gas Regulation?

  1. To confirm the system meets electrical safety standards
  2. To verify the compressor oil level
  3. To detect refrigerant escapes and prevent emissions Correct answer.
  4. To measure the cooling capacity of the system

Explanation

Leak checks are required to detect refrigerant escapes so that emissions of fluorinated greenhouse gases are minimised. They do not test electrical safety or performance capacity.

Question 9F-Gas and ODS regulations

A Category III certificate holder recovers refrigerant from a small stationary refrigeration unit. Which action best reflects the containment principle of the Regulation?

  1. Venting the recovered gas to atmosphere if it is a small quantity
  2. Recovering the gas into a suitable container for recycling or destruction Correct answer.
  3. Mixing recovered gas with air before disposal
  4. Releasing the gas slowly to avoid pressure build-up

Explanation

Recovered refrigerant must be collected in suitable containers and sent for reclamation, recycling or destruction. Deliberate venting of fluorinated greenhouse gases is prohibited.

Question 10F-Gas and ODS regulations

An operator has a stationary refrigeration system containing 8 tonnes of CO2 equivalent of HFC. How often must a leak check normally be carried out?

  1. Every 24 months
  2. Every 3 months
  3. Every 12 months Correct answer.
  4. Every 6 months

Explanation

Systems at or above 5 tonnes CO2 equivalent but below 50 tonnes must normally be leak checked at least every 12 months. More frequent checks apply at higher thresholds.

Question 11F-Gas and ODS regulations

A stationary refrigeration system contains 60 tonnes of CO2 equivalent of HFC and has no permanent leak detection system. What is the standard leak check frequency?

  1. Every 3 months
  2. Every 24 months
  3. Every 12 months
  4. Every 6 months Correct answer.

Explanation

Systems at or above 50 tonnes CO2 equivalent but below 500 tonnes require leak checks at least every six months where no permanent detection system is fitted.

Question 12F-Gas and ODS regulations

A system containing 600 tonnes of CO2 equivalent of HFC has a permanent leak detection system installed. What is the minimum leak check frequency?

  1. Every 3 months
  2. Every 6 months
  3. Every 12 months Correct answer.
  4. Every 24 months

Explanation

Where a permanent leak detection system is fitted, the required interval is halved, so at the 500 tonne CO2e threshold and above the check interval becomes every 12 months.

Question 13F-Gas and ODS regulations

When a leak is detected and repaired on a system subject to leak checks, when must a follow-up check normally be carried out?

  1. Within one month of the repair Correct answer.
  2. Within twelve months of the repair
  3. Within six months of the repair
  4. Within three months of the repair

Explanation

After a leak is repaired, a follow-up leak check must be carried out within one month to confirm the repair has been effective.

Question 14F-Gas and ODS regulations

Which of the following is an acceptable method for leak testing a stationary refrigeration circuit under the Regulation?

  1. Using an open flame to trace the leak
  2. Using a soap solution on joints Correct answer.
  3. Using a colour dye visible to the naked eye only
  4. Using compressed air to pressurise the circuit

Explanation

Leak detection methods include use of electronic detectors, UV dyes and soap solutions on joints. Open flames and pressurising with air are unsafe or unsuitable.

Question 15F-Gas and ODS regulations

A technician recovers refrigerant from a system and intends to reuse it in another system. What must happen to the recovered refrigerant first?

  1. It must be diluted with nitrogen
  2. It must be reclaimed to the appropriate standard Correct answer.
  3. It must be stored in an open container
  4. It must be vented and recharged with new gas

Explanation

Refrigerant intended for reuse must be reclaimed to the relevant purity standard before being charged into another system. Venting and open storage are prohibited.

Question 16F-Gas and ODS regulations

What is the primary purpose of the F-Gas Regulation's phase-down schedule for HFCs?

  1. To ban all refrigeration equipment
  2. To increase the use of CFCs
  3. To require annual replacement of compressors
  4. To reduce the quantity of HFCs placed on the market over time Correct answer.

Explanation

The phase-down progressively reduces the quantity of HFCs that may be placed on the market, expressed in CO2 equivalent. It does not ban refrigeration equipment outright.

Question 17F-Gas and ODS regulations

Which refrigerant would a technician expect to be outside the scope of the F-Gas Regulation?

  1. R-407C
  2. R-404A
  3. R-290 (propane) Correct answer.
  4. R-410A

Explanation

R-290 (propane) is a hydrocarbon refrigerant and is not a fluorinated greenhouse gas, so it is outside the F-Gas Regulation. R-410A, R-407C and R-404A are HFC blends and are in scope.

Question 18F-Gas and ODS regulations

A technician finds a leaking joint on a system containing 200 tonnes of CO2 equivalent of HFC. What is the correct sequence of actions?

  1. Ignore the leak if the system still cools adequately
  2. Repair the leak, then wait twelve months before checking
  3. Repair the leak, then carry out a follow-up leak check within one month Correct answer.
  4. Vent the remaining gas, then repair the joint

Explanation

The leak must be repaired as soon as practicable and a follow-up check carried out within one month to confirm effectiveness. Venting is prohibited and cooling performance is not a valid reason to ignore a leak.

Question 19F-Gas and ODS regulations

What does the CO2 equivalent of a refrigerant charge represent?

  1. The volume of refrigerant at standard conditions
  2. The pressure rating of the system
  3. The mass of refrigerant multiplied by its GWP Correct answer.
  4. The mass of refrigerant divided by its GWP

Explanation

CO2 equivalent is calculated by multiplying the mass of refrigerant by its global warming potential. This figure determines which leak check thresholds apply.

Question 20F-Gas and ODS regulations

A system contains 25 kg of R-134a. Using a GWP of 1430 for R-134a, what is the approximate CO2 equivalent of the charge?

  1. About 0.36 tonnes CO2e
  2. About 3.6 tonnes CO2e
  3. About 360 tonnes CO2e
  4. About 36 tonnes CO2e Correct answer.

Explanation

CO2 equivalent equals mass in kilograms multiplied by GWP, giving 25 × 1430 = 35,750 kg, or about 36 tonnes CO2e. This places the system in the 5 to 50 tonne band for leak checks.

Question 21F-Gas and ODS regulations

Which of the following is a duty placed on operators of stationary refrigeration equipment under the F-Gas Regulation?

  1. Ensuring leak checks are carried out by certified personnel Correct answer.
  2. Publishing annual energy consumption figures
  3. Replacing all HFC systems within one year
  4. Installing permanent detection on every system

Explanation

Operators must ensure that leak checks and refrigerant handling are carried out by appropriately certified personnel and that records are maintained. Permanent detection is only required above certain thresholds.

Question 22F-Gas and ODS regulations

What information should a refrigerant recovery record typically contain?

  1. The ambient humidity during recovery
  2. The name of the equipment manufacturer only
  3. The type and quantity of refrigerant recovered and the date Correct answer.
  4. The colour of the recovery cylinder

Explanation

Records should identify the refrigerant type, quantity recovered and the date of the operation, supporting traceability of controlled substances.

Question 23F-Gas and ODS regulations

A technician without a valid certificate is asked to recover refrigerant from a stationary system. What is the correct response?

  1. Refuse the work until a certified person is available Correct answer.
  2. Proceed if the quantity is small
  3. Proceed if the system is switched off
  4. Proceed if the customer signs a waiver

Explanation

Only certified personnel may carry out recovery and containment activities on equipment containing fluorinated greenhouse gases. Small quantity, isolation or customer consent do not remove this requirement.

Question 24F-Gas and ODS regulations

What is the role of a leak detection system fitted to a large stationary refrigeration system?

  1. To filter moisture from the refrigerant
  2. To cool the compressor during operation
  3. To continuously monitor for refrigerant leaks and alert the operator Correct answer.
  4. To regulate the system's discharge pressure

Explanation

Permanent leak detection systems continuously monitor for leaks so that escapes are identified quickly. They do not perform cooling, filtration or pressure regulation functions.

Question 25F-Gas and ODS regulations

Which statement best describes the certification requirement for personnel recovering refrigerant from stationary refrigeration equipment?

  1. Certification is only required when reclaiming on site
  2. Certification is required for all such recovery work Correct answer.
  3. Certification is only required for flammable refrigerants
  4. Certification is only required for systems above 500 tonnes CO2e

Explanation

Certification applies to recovery and containment activities regardless of system size or refrigerant type. Thresholds affect leak check frequency, not the certification requirement.

Question 26F-Gas and ODS regulations

Which gases are controlled under the F-Gas Regulation?

  1. Fluorinated greenhouse gases only Correct answer.
  2. All greenhouse gases
  3. Fluorinated greenhouse gases and ozone-depleting substances
  4. Ozone-depleting substances only

Explanation

The F-Gas Regulation specifically targets fluorinated greenhouse gases (F-gases), which include HFCs, PFCs, and SF6. Ozone-depleting substances are controlled under a separate regulation. Other greenhouse gases like CO2 and methane are not covered by the F-Gas Regulation.

Question 27F-Gas and ODS regulations

What is the primary purpose of the F-Gas Regulation?

  1. To promote the use of ozone-depleting substances
  2. To reduce emissions of fluorinated greenhouse gases Correct answer.
  3. To regulate the price of refrigerants
  4. To ban all refrigeration systems

Explanation

The F-Gas Regulation aims to reduce emissions of fluorinated greenhouse gases through measures such as containment, recovery, and phase-down of HFCs. It does not promote ODS use, regulate prices, or ban refrigeration systems.

Question 28F-Gas and ODS regulations

Which of the following is an example of a fluorinated greenhouse gas?

  1. R-744 (carbon dioxide)
  2. R-717 (ammonia)
  3. R-134a Correct answer.
  4. R-290 (propane)

Explanation

R-134a is an HFC, which is a fluorinated greenhouse gas. Ammonia (R-717), carbon dioxide (R-744), and propane (R-290) are natural refrigerants and are not F-gases.

Question 29F-Gas and ODS regulations

What does the term 'recovery' mean in the context of the F-Gas Regulation?

  1. The collection and storage of fluorinated greenhouse gases from equipment Correct answer.
  2. The destruction of fluorinated greenhouse gases
  3. The reuse of recovered refrigerant after basic cleaning
  4. The process of reclaiming refrigerant to virgin specification

Explanation

Recovery is the collection and storage of F-gases from equipment at end-of-life or during service. Reuse, destruction, and reclaiming are separate activities that may follow recovery.

Question 30F-Gas and ODS regulations

Which of the following is a responsibility of an operator of stationary refrigeration equipment under the F-Gas Regulation?

  1. Ensuring that refrigerant is recovered by certified personnel Correct answer.
  2. Selling the refrigeration equipment
  3. Designing the refrigeration system
  4. Manufacturing the refrigerant

Explanation

Operators must ensure that refrigerant is recovered by certified personnel when the equipment is serviced or decommissioned. Design, manufacturing, and selling are not operator responsibilities under the regulation.

Question 31F-Gas and ODS regulations

What is the minimum certification required for personnel recovering refrigerant from stationary refrigeration systems?

  1. A Category II certificate
  2. A Category IV certificate
  3. A Category I certificate
  4. A Category III certificate Correct answer.

Explanation

Category III certification covers the recovery of refrigerant from stationary refrigeration systems. Category I is for all activities, Category II for larger systems, and Category IV for leak checking only.

Question 32F-Gas and ODS regulations

Which record must be kept when refrigerant is recovered from stationary refrigeration equipment?

  1. A record of the ambient temperature during recovery
  2. A record of the technician's training hours
  3. A record of the quantity and type of refrigerant recovered Correct answer.
  4. A record of the equipment's purchase price

Explanation

The F-Gas Regulation requires records of the quantity and type of refrigerant recovered. Records of purchase price, training hours, and ambient temperature are not required.

Question 33F-Gas and ODS regulations

What is the purpose of the F-Gas Regulation's phase-down schedule for HFCs?

  1. To gradually reduce the quantity of HFCs placed on the market Correct answer.
  2. To ban the use of natural refrigerants
  3. To increase the production of HFCs
  4. To require the use of HFCs in all new equipment

Explanation

The phase-down schedule aims to gradually reduce the quantity of HFCs placed on the EU market by setting maximum annual quotas. It does not increase production, ban natural refrigerants, or mandate HFC use.

Question 34F-Gas and ODS regulations

What does the global warming potential (GWP) of a refrigerant indicate?

  1. Its flammability rating
  2. Its ozone depletion potential
  3. Its toxicity level
  4. Its contribution to climate change relative to CO2 Correct answer.

Explanation

GWP is a measure of how much a greenhouse gas contributes to climate change compared to carbon dioxide (which has a GWP of 1). It does not indicate toxicity, flammability, or ozone depletion potential.

Question 35F-Gas and ODS regulations

A technician recovers refrigerant from a system and intends to reuse it in another system. What must happen to the recovered refrigerant before it can be reused?

  1. It must be mixed with virgin refrigerant
  2. It must be destroyed
  3. It must be reclaimed to the appropriate standard Correct answer.
  4. It must be vented to the atmosphere

Explanation

Recovered refrigerant that is to be reused must be reclaimed to the appropriate standard to ensure it meets specifications. Destruction, venting, or mixing with virgin refrigerant are not acceptable for reuse.

Question 36F-Gas and ODS regulations

Which of the following is an acceptable method for leak testing a stationary refrigeration circuit under the F-Gas Regulation?

  1. Using a soap bubble solution
  2. Using a halide torch
  3. Using a pressure gauge only
  4. Using a calibrated electronic leak detector Correct answer.

Explanation

Calibrated electronic leak detectors are an acceptable method for leak testing. Soap bubbles are not suitable for all refrigerants, halide torches are not allowed due to toxicity and flammability risks, and pressure gauges do not detect leaks.

Question 37F-Gas and ODS regulations

Which statement best describes the certification requirement for personnel recovering refrigerant from stationary refrigeration systems?

  1. They must hold a valid Category II certificate
  2. They must hold a valid Category I certificate
  3. They must hold a valid Category IV certificate
  4. They must hold a valid Category III certificate Correct answer.

Explanation

Personnel recovering refrigerant from stationary refrigeration systems must hold a valid Category III certificate. Categories I and II cover broader activities, and Category IV is for leak checking only.

Question 38F-Gas and ODS regulations

Which of the following is a requirement for the proper recovery of refrigerant from a stationary refrigeration system?

  1. Venting the refrigerant to the atmosphere if it is a small amount
  2. Using recovery equipment that is suitable for the refrigerant type Correct answer.
  3. Mixing different refrigerants in the same recovery cylinder
  4. Recovering the refrigerant into a non-refillable container

Explanation

Recovery equipment must be suitable for the refrigerant type to ensure safe and effective recovery. Venting is prohibited, mixing refrigerants is not allowed, and non-refillable containers are not used for recovery.

Question 39F-Gas and ODS regulations

Which of the following refrigerants is considered a fluorinated greenhouse gas?

  1. R-290
  2. R-404A Correct answer.
  3. R-744
  4. R-717

Explanation

R-404A is a blend containing HFCs and is therefore a fluorinated greenhouse gas. R-717 (ammonia), R-744 (carbon dioxide), and R-290 (propane) are natural refrigerants and not F-gases.

Question 40F-Gas and ODS regulations

A technician is recovering refrigerant from a system that contains a mixture of R-134a and R-22. What is the correct action?

  1. Refuse to recover the mixture because it contains R-22
  2. Recover the mixture into the same container as virgin R-134a
  3. Recover the mixture into a separate container and label it as mixed refrigerant Correct answer.
  4. Vent the mixture to the atmosphere

Explanation

Mixed refrigerants must be recovered into a separate container and labelled as mixed to prevent contamination. Venting is illegal, mixing with virgin refrigerant is not allowed, and recovery is still required even if the mixture contains R-22.

Question 41F-Gas and ODS regulations

Which of the following best describes the 'placing on the market' of HFCs under the F-Gas Regulation?

  1. The destruction of HFCs
  2. The recovery of HFCs from a system
  3. The use of HFCs in a refrigeration system
  4. The first supply or making available of HFCs to another party Correct answer.

Explanation

Placing on the market refers to the first supply or making available of HFCs to another party, which triggers quota obligations. Use, recovery, and destruction are separate activities.

Question 42F-Gas and ODS regulations

A technician is servicing a system that uses R-410A. The system has a charge of 10 kg. Using a GWP of 2088 for R-410A, what is the CO2 equivalent of the charge?

  1. 20.88 tonnes CO2 equivalent Correct answer.
  2. 2088 tonnes CO2 equivalent
  3. 10 tonnes CO2 equivalent
  4. 0.01 tonnes CO2 equivalent

Explanation

CO2 equivalent is calculated as mass × GWP: 10 kg × 2088 = 20,880 kg CO2e, which is 20.88 tonnes. The other options do not correctly apply the formula.

Question 43F-Gas and ODS regulations

Which of the following is a key obligation for operators regarding record-keeping under the F-Gas Regulation?

  1. Maintaining records of refrigerant quantities and leak checks for at least five years Correct answer.
  2. Keeping records only for systems above 100 tonnes CO2 equivalent
  3. Keeping records only when a leak is detected
  4. Keeping records for at least one year

Explanation

Operators must maintain records of refrigerant quantities and leak checks for at least five years. Records are required for all systems subject to leak checks, not only large ones or when leaks occur.

Question 44F-Gas and ODS regulations

Which of the following is a controlled substance under the Ozone Depleting Substances Regulation?

  1. R-134a
  2. R-410A
  3. R-22 Correct answer.
  4. R-744

Explanation

The ODS Regulation controls substances that deplete the ozone layer, such as chlorofluorocarbons (CFCs) and hydrochlorofluorocarbons (HCFCs). R-22 is an HCFC and is therefore controlled. R-410A and R-134a are HFCs (controlled under the F-Gas Regulation), and R-744 (carbon dioxide) is not an ODS.

Question 45F-Gas and ODS regulations

Under the F-Gas Regulation, which of the following is a requirement for placing new equipment containing HFCs on the market?

  1. The HFC charge must be below the GWP limit specified for that equipment type. Correct answer.
  2. The equipment must be pre-charged with a refrigerant that has a GWP of zero.
  3. The equipment must be registered with the European Commission before sale.
  4. The equipment must be sold with a 10-year leak warranty.

Explanation

The F-Gas Regulation sets GWP limits for certain types of new equipment placed on the market, such as domestic refrigerators and commercial refrigeration cabinets. Equipment exceeding the applicable GWP limit cannot be placed on the market. Registration and warranty requirements are not general conditions for placing equipment on the market.

Question 46F-Gas and ODS regulations

A company uses a bulk supply of R-404A to service several refrigeration systems. Under the F-Gas Regulation, what must the company do with the refrigerant container?

  1. Store it in a sealed container without labelling.
  2. Vent any residual refrigerant before disposal.
  3. Return it to the supplier without any documentation.
  4. Label it clearly with the refrigerant type and GWP. Correct answer.

Explanation

The F-Gas Regulation requires that refrigerant containers be labelled with the refrigerant designation and its global warming potential. This ensures safe handling and compliance with traceability requirements. Venting residual refrigerant is prohibited, and returning containers without documentation does not meet record-keeping obligations.

Question 47F-Gas and ODS regulations

A technician is decommissioning a stationary refrigeration system containing 50 kg of R-134a. What is the correct procedure for the refrigerant under the F-Gas Regulation?

  1. Release the refrigerant slowly to the atmosphere.
  2. Transfer the refrigerant to a non-certified container for storage.
  3. Recover the refrigerant and have it reclaimed or destroyed. Correct answer.
  4. Burn the refrigerant on site.

Explanation

The F-Gas Regulation requires that refrigerant be recovered from equipment before dismantling or disposal. Recovered refrigerant must then be reclaimed, recycled, or destroyed by certified personnel. Release to the atmosphere and on-site burning are prohibited.

Question 48F-Gas and ODS regulations

Which of the following best describes the requirement for leak checks on stationary refrigeration equipment containing 5 tonnes CO2e or more of F-Gas?

  1. Leak checks are required only for equipment using R-22.
  2. Leak checks are only required if the equipment contains 50 tonnes CO2e or more.
  3. Leak checks must be performed at least every 12 months. Correct answer.
  4. Leak checks must be performed by the operator without certification.

Explanation

Under the F-Gas Regulation, stationary refrigeration equipment containing 5 tonnes CO2e or more of fluorinated greenhouse gases must be checked for leaks at least every 12 months. More frequent checks apply at higher thresholds. Leak checks must be carried out by certified personnel.

Question 49F-Gas and ODS regulations

A technician discovers that a system containing 100 kg of R-404A has a leak. The system is not equipped with a leak detection system. Under the F-Gas Regulation, what is the maximum interval between leak checks once the leak is repaired?

  1. Every 6 months Correct answer.
  2. Every 3 months
  3. Every 12 months
  4. Every 24 months

Explanation

For stationary refrigeration equipment containing 50 tonnes CO2e or more but less than 500 tonnes CO2e, leak checks must be performed at least every 6 months (or every 12 months if a leak detection system is installed). R-404A has a GWP of 3922, so 100 kg equates to 392.2 tonnes CO2e, falling into the 6-month interval category.

Question 50F-Gas and ODS regulations

A technician recovers refrigerant from a stationary refrigeration system and the recovered gas is found to be contaminated. Under the F-Gas Regulation, which outcome best describes how such recovered refrigerant must be handled?

  1. It must be returned to the equipment manufacturer regardless of whether reclamation is technically possible.
  2. It may be reused in any system once the recovery cylinder has been labelled with the date of recovery.
  3. It must be reclaimed or destroyed by an authorised undertaking rather than simply vented or reused as-is. Correct answer.
  4. It may be vented to atmosphere provided the quantity recovered is under 5 tonnes of CO2 equivalent.

Explanation

Recovered refrigerant that cannot be cleaned to the required purity must be handled by an authorised reclamation or destruction route. Venting is prohibited, and reuse is only permitted where the refrigerant meets the relevant specification. Labelling alone does not make contaminated refrigerant fit for reuse.