Under what weight are the sale of small containers of refrigerant restricted to only those certified in Section 609?

The sale of small containers of refrigerant is restricted to those who are certified under Section 609 for containers weighing 20 pounds or less. This regulation is in place to ensure that only properly trained technicians handle refrigerants, which can be harmful to both the environment and human health if not managed correctly.

Section 609 is specifically designed to regulate the use of refrigerants in automotive air conditioning systems, and certification ensures that technicians understand how to handle these substances safely. Therefore, the emphasis on a 20-pound limit is critical, as it signifies the threshold where such regulatory certification is required to promote responsible and safe usage practices in the industry. This helps to mitigate the risks associated with refrigerant leaks and improper handling, thereby protecting technicians and the environment.