R407F RefrigerantA1 refrigeration blend · lower-GWP than R404A / R507A · legacy transition role
R407F is a nonflammable HFC blend used mainly in commercial refrigeration and retrofit discussions around R404A and R507A systems. Its GWP is lower than R404A, but it is still a relatively high-GWP refrigerant by today’s transition standards. That makes R407F useful as a bridge or legacy transition fluid rather than a long-term “future-proof” endpoint.
What is R407F refrigerant?
R407F should be understood as a practical A1 refrigeration blend from the earlier transition era. EPA composition tables identify it as 30% R32, 30% R125 and 40% R134a, and EPA SNAP tables commonly show GWP 1,820 with A1 safety classification. It has real relevance because it was positioned as a lower-GWP alternative to R404A / R507A, especially in low- and medium-temperature refrigeration, but the current regulatory direction increasingly favors even lower-GWP options.
R407F is a nonflammable HFC blend used mainly in commercial refrigeration and retrofit discussions around R404A and R507A systems. Its GWP is lower than R404A, but it is still a relatively high-GWP refrigerant by today’s transition standards. That makes R407F useful as a bridge or legacy transition fluid rather than a long-term “future-proof” endpoint.
R407F technical properties
Core reference data and selection notes for R407F based on the positioning used in this page.
| Designation | R407F | ASHRAE refrigerant designation |
|---|---|---|
| Nominal composition | R32 / R125 / R134a = 30 / 30 / 40 | EPA composition table |
| Refrigerant type | Zeotropic HFC blend | Blend with glide |
| ODP | 0 | No ozone depletion |
| 100-year GWP | 1,820 | Common EPA SNAP table value |
| Older rounded references | ≈1,825 | Some secondary EPA materials |
| Safety classification | A1 | Nonflammable |
| Primary role | Commercial refrigeration | Often discussed vs R404A / R507A |
| Application range | Low- and medium-temperature refrigeration | Commercial systems |
| Selection theme | A1 transition refrigerant | Bridge from very high GWP legacy blends |
Where R407F is used
These are the most relevant application contexts for R407F in practical HVACR and thermal-system discussions.
Commercial ice machines
EPA lists R407F as acceptable in commercial ice machines.
Stand-alone low-temperature equipment
EPA tables listed R407F for certain stand-alone low-temp uses, though newer transition rules restrict many new high-GWP uses.
Remote condensing / supermarket discussions
R407F is often evaluated in commercial refrigeration where R404A or R507A legacy systems are involved.
Medium-temperature refrigeration
Can be used where capacity and efficiency tradeoffs fit the application.
Low-temperature refrigeration
Often discussed where a nonflammable R404A-class transition blend is preferred.
Legacy installed-base management
Relevant as part of the “keep, retrofit, or replace” decision for older refrigeration assets.
Detailed analysis
Why R407F mattered in the first transition wave
R407F became relevant because it offered a step down from the extremely high GWP of R404A while retaining A1 safety. At the time, that made it attractive for operators who wanted a more practical change than a complete technology shift.
This historical role still matters for content strategy because many installed systems, service decisions and archived technical documents still reference R407F.
A strong page should therefore explain both its original value and its current regulatory limitations.
R407F is better understood as a bridge refrigerant than a long-term endpoint
Compared with R404A or R507A, R407F reduces direct climate impact. However, a GWP around 1,820 is still high relative to today’s low-GWP direction.
In practice, that means R407F often appears in transitional or retrofit narratives rather than as the final destination for decarbonization planning.
This is exactly the kind of nuance readers need when choosing between short-term practicality and long-term compliance.
Why the A1 classification still matters
Even as lower-GWP A2L and natural-refrigerant options gain ground, there are still projects where nonflammability is a major decision factor.
For those cases, R407F historically offered a familiar A1 pathway with more manageable retrofit implications than a complete redesign.
However, A1 safety alone does not outweigh the growing policy pressure on higher-GWP refrigerants.
What technicians should remember about the blend nature
R407F is a zeotropic blend, not a pure refrigerant. That means charging, fractionation risk, pressure-temperature interpretation and service practices differ from single-component refrigerants.
The correct PT chart and blend-aware procedures should be used in service work.
Good content should emphasize this practical handling reality instead of treating R407F as just a numeric GWP entry.
R407F vs R438A
A focused side-by-side comparison to help readers understand selection differences.
| Comparison Point | R407F | R438A |
|---|---|---|
| Primary replacement story | R404A / R507A class | R22 class |
| Safety class | A1 | A1 |
| ODP | 0 | 0 |
| 100-year GWP | 1,820 | 2,270 |
| Type | Zeotropic HFC blend | Zeotropic HFC/HC blend |
| Core use | Commercial refrigeration | Air conditioning / refrigeration retrofit |
| Regulatory position | Bridge refrigerant, not low GWP | Legacy retrofit refrigerant, also not low GWP |
R407F safety: A1 simplifies flammability, but it is still a zeotropic refrigerant blend
R407F is A1 and therefore avoids lower-flammability system constraints. Even so, it remains a refrigerant blend with pressure hazards, cold-burn risk and blend-handling requirements. Correct charging and system suitability checks are important, especially in retrofit work.
- A1 classification: No lower-flammability designation.
- Blend servicing: Use correct PT data and charge as a blend.
- Retrofit discipline: Validate lubricant, controls and actual equipment performance.
Leak detection
Leak detection for R407F should be based on the intended function: maintenance leak finding, machinery-room monitoring or environmental concentration awareness. Infrared or electronic halogenated-refrigerant detection may be appropriate depending on the application. GasNose offers broader refrigerant gas detection context for research and concept validation.
U.S. regulations
EPA SNAP tables commonly show R407F at GWP 1,820 and A1. It remains relevant in certain listed uses such as commercial ice machines and some legacy equipment contexts, but EPA’s more recent Technology Transitions direction increasingly pushes new equipment away from higher-GWP HFCs in many commercial refrigeration sectors.
EU / international context
In Europe, R407F also sits in a transition category rather than a leading low-GWP category. It may still appear in retrofit or installed-base management discussions, but it does not offer the same long-term numerical advantage as newer low-GWP solutions.
Phaseout / long-term view
R407F is best viewed as a legacy bridge refrigerant. Its future is constrained less by safety than by its still-relatively-high GWP compared with modern alternatives.
Misconceptions to avoid
Several refrigerants are misunderstood because readers focus on one number or one trade name. These points help keep the topic accurate.
“R407F is a low-GWP refrigerant.”
It is lower than R404A, but at about 1,820 GWP it is not low by current transition standards.
“A1 means R407F is automatically future-proof.”
A1 helps on flammability, but climate policy still limits high-GWP refrigerants.
“R407F is a pure refrigerant.”
No. It is a zeotropic blend of R32, R125 and R134a.
“R407F is only a data-sheet refrigerant with no real relevance.”
It has real historical and service relevance in commercial refrigeration.
R407F refrigerant FAQ
Concise answers to common questions about properties, uses, safety class and regulatory context.
What is R407F?
R407F is an A1 HFC blend used mainly in commercial refrigeration, especially in relation to R404A / R507A transition discussions.
What is the composition of R407F?
EPA composition tables show 30% R32, 30% R125 and 40% R134a.
What is the GWP of R407F?
EPA SNAP tables commonly show 1,820, while some older secondary materials round to about 1,825.
Is R407F flammable?
No. It is classified A1.
Is R407F a blend?
Yes. It is a zeotropic blend.
What is R407F used for?
Mostly commercial low- and medium-temperature refrigeration applications.
Is R407F low GWP?
Not by current standards. It is lower than R404A, but still relatively high GWP.
Why was R407F important?
Because it offered a lower-GWP A1 pathway for some R404A / R507A-era systems.
Can R407F be treated as a long-term endpoint?
Usually no; it is better understood as a bridge refrigerant.
How should R407F leaks be detected?
Use refrigerant detection matched to the intended function and validated for halogenated refrigerants.
Authoritative sources
Primary EPA references are prioritized, with supporting official or technical industry sources where helpful.
- EPA — Compositions of Refrigerant Blends
- EPA — Substitutes in Commercial Ice Machines
- EPA — Substitutes in Stand-alone Equipment
- EPA — Technology Transitions Fact Sheet / higher-GWP sectors
- EPA — Transitioning to Low-GWP Alternatives in Commercial Refrigeration
- HON — Honeywell commercial refrigeration presentation
- EPA — Household Refrigerators and Freezers SNAP table
- GAS — GasNose Refrigerant Gas Library
Need help selecting or monitoring refrigerants?
Refrigerant choice is not only about GWP. Safety class, end use, machinery design, regulations and leak detection strategy all matter. If you are evaluating a transition project, ask for technical support.