Final answer:
R-410A refrigerant requires recovery and recycling machines to be rated for at least 400 psig to manage its high-pressure characteristics safely and meet environmental regulations.
Step-by-step explanation:
R-410A refrigerant requires certified recovery and recycling machines to be rated for at least 400 psig (pounds per square inch gauge). This is consistent with the high-pressure nature of R-410A systems, which typically operate at higher pressures than older refrigerants like R-22. It is essential that the recovery equipment is capable of handling these pressures safely to ensure that there is no release of refrigerant into the atmosphere during service or disposal operations, in compliance with environmental regulations.