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
Sensors and detectors for R-407A monitoring
cGas Detector VRF IR Refrigerant Transmitter
An aesthetic, non-dispersive infrared refrigerant gas detector for acute leak detection in modern energy-efficient buildings utilizing Variable Refrigerant Flow (VRF) HVAC systems.
cGas-SC Self-Contained Controller
A self contained controller with up to 3 gas channels, Plug & Play Smart Sensor Technology and configurable logic control and priority settings. Offers superior user customization and reliable gas detection performance for monitoring many gases.
cGas Detector IR Refrigerant Transmitter
Non-dispersive infrared refrigerant gas detector with accurate, low level leak detection, available with analog output or BACnet® or Modbus® output and Plug & Play Smart Sensor Technology.
FCS Multi Channel System Controllers
High performance controller with logic and priority settings for monitoring toxic, combustible and refrigerant gases with versatile control functionality. Available with Modbus® or BACnet® communication with BAS, supports 4-20 mA and Modbus® driven VFDs.