Section 609 addresses the mobile motor vehicle air conditioning industry. Section 609 Certification allows the purchase of any refrigerant in any size container from an auto supply house for use in cooling the passenger compartment of vehicles including the "one pound" cans. The purpose of 609 (Mobile Vehicle Air Conditioning) certification, as established by EPA, is to teach technicians and test their ability to properly handle and recover refrigerants. Technicians will also learn about the laws enacted to protect the stratospheric ozone layer.
The EPA Section 609 MVAC Manual can be accessed by clicking the link below. Once you have opened the manual you can search it by using your web browser's search function (usually accessed by hitting Ctrl + F).