According to Section 608, HVAC/R technicians cannot buy refrigerant in quantities less than what?

In accordance with Section 608 of the Clean Air Act regulations, HVAC/R technicians are prohibited from purchasing refrigerants in quantities less than 20 pounds. This regulation is in place to ensure that only certified technicians who have received proper training and understand the handling and management of refrigerants can purchase these materials in significant amounts. The intent is to prevent misuse and to uphold the environmental protections that the regulations aim to enforce. Technicians holding the necessary certification can thereby ensure they are compliant with the regulations surrounding the use of refrigerants and their potential environmental impacts. The other quantity options are not correct because they fall below the minimum threshold established by these standards, which is specifically set at 20 pounds.