Working with Propane Refrigerant: A3 Safety, Charging, and Tools
Key Takeaways A3 means higher flammability, not “mildly flammable”: ASHRAE 34 classifies R-290 (propane) and R-600A (isobutane) as Class A3: higher flammability with lower ignition energy and a wider flammable range than A2L...
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