EPA.gov: Overview of Issues on EPA Certification Test EPA Universal Certification EPA Section 608 re gulatory requirements EPA Guide to Clean Air Act Refrigerant Requirements re gulatory requirements EPA Section 608 https://www/epa.gov/section 608 Section 608 Technician Certification EPA Guide to Clean Air Act Refrigerant Requirements Freon EPA Stationary Refrigeration and Air Conditioning EPA Refrigeration EPA Section 608 certification EPA Section 608 Ozone Layer Protection: Steps For Replacing a Lost Card CFCs EPA’s Section 608 Web Page EPA Section 608 EPA Section 608 certification www.epa.gov/section608 Section 608 www.epa.gov/section608 EPA Section 608 certification page EPA Refrigerant EPA Section 608 US Environmental Protection Agency – Section 608 EPA Section 608 certification procedures EPA Guide to Clean Air Act Refrigerant Requirements EPA 608 Certification certified to handle refrigerant Environmental Protection Agency. EPA 608 Certification EPA Section 608 heavily regulated https://www.epa.gov/section608 US EPA Region 10