R-407A
R32/R125/R134aR-407A is a zeotropic HFC refrigerant blend (R-32/R-125/R-134a at 20/40/40%) developed as a medium-temperature alternative to R-404A with improved environmental performance. With a GWP of 2,107—approximately half that of R-404A—R-407A offers a transitional option for commercial refrigeration retrofit and new systems. The zeotropic nature results in temperature glide during phase change, requiring consideration in system design and charging procedures. R-407A provides compatible performance with R-404A systems with minor modifications, making it suitable for retrofit applications in supermarkets and cold storage. While not a long-term solution due to GWP regulations, R-407A serves as an interim step toward ultra-low-GWP alternatives.
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Key Information
Essential safety and exposure information for R-407A
Health Effects
Low acute toxicity. May cause cardiac sensitization. Can displace oxygen in enclosed spaces causing asphyxiation.
Common Sources
- Commercial refrigeration
- supermarkets
- cold rooms
- display cases
Exposure Limits
- WEEL
- 1,000 ppm (8-hr TWA)
- No OSHA/NIOSH limit
- No OSHA/NIOSH limit
- Blend of R32/R125/R134a
- Blend of R32/R125/R134a
Regulatory Status
- EPA Classification
- HFC blend (non-ODS)
- ASHRAE Safety Group
- A1 (low toxicity, non-flammable)
- GWP (AR5)
- 2,107
- ODP
- 0
- Temperature Glide
- Approximately 6°C
- AIM Act
- Subject to phase-down but lower priority than R-404A
Detection Requirements
- Sensor Technology
- Infrared (NDIR)
- Detection Range
- 0-1,000 ppm typical
- Response Time
- <30 seconds (T90)
- Calibration Frequency
- Annual recommended
- Temperature Glide
- 6-7°C due to zeotropic behavior
Detection Solutions Coming Soon
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