R-404A
R125/R143a/R…R-404A is a near-azeotropic HFC refrigerant blend (R-125/R-143a/R-134a) that became the dominant choice for commercial refrigeration following the CFC phase-out. Used extensively in supermarket display cases, cold storage, transport refrigeration, and ice machines, R-404A offers reliable performance across medium and low-temperature applications. However, with a GWP of 3,922, R-404A is a primary target of phase-down regulations worldwide. The EPA AIM Act, EU F-gas regulation, and California CARB rules are driving rapid transition to lower-GWP alternatives like R-448A, R-449A, and R-454C. Existing R-404A systems require diligent leak detection and maintenance to minimize emissions during the transition period.
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Key Information
Essential safety and exposure information for R-404A
Health Effects
May cause cardiac sensitization at high concentrations. Can displace oxygen causing asphyxiation. Avoid contact with open flames as decomposition products are toxic.
Common Sources
- Supermarket display cases
- cold storage
- transport refrigeration
- ice machines
Exposure Limits
- WEEL
- 1,000 ppm (8-hr TWA)
- No OSHA/NIOSH limit
- No OSHA/NIOSH limit
- Blend of R125/R143a/R134a
- Blend of R125/R143a/R134a
Regulatory Status
- EPA Classification
- HFC blend (non-ODS)
- ASHRAE Safety Group
- A1 (low toxicity, non-flammable)
- GWP (AR5)
- 3,922
- ODP
- 0
- AIM Act
- Priority phase-down; restricted in new equipment
- EU F-gas
- Banned in new stationary refrigeration since 2020 (some exceptions)
Detection Requirements
- Sensor Technology
- Infrared (NDIR)
- Detection Range
- 0-1,000 ppm typical for leak detection
- Response Time
- <30 seconds (T90)
- Calibration Frequency
- Annual recommended
- Fractionation
- Minimal due to near-azeotropic behavior
Detection Solutions Coming Soon
We're working on adding related products and applications for R-404A.