Core Viewpoint - The Shenzhen Gas Industry Association has released the sales directory for gas-burning appliances compatible with the city's gas supply, which has been providing guidance for safe and qualified gas appliance purchases for 22 years [1]. Group 1: Sales Directory and Compliance - The new sales directory includes 29 brands of gas appliances that have passed the review, comprising 119 types of household gas stoves, 301 types of gas water heaters, and 50 types of commercial gas stoves [1]. - Since 2011, nearly 9.2 million gas source compatibility labels have been issued to help users select safe and qualified gas appliances [1]. - The "Shenzhen Special Economic Zone Urban Gas Management Regulations" effective from November 1, 2023, mandates that gas appliance installation and maintenance must be conducted by certified companies [1]. Group 2: Installation and Maintenance Standards - Installation and maintenance companies must possess a gas appliance installation and maintenance qualification certificate issued by the Shenzhen Gas Industry Association [2]. - Installation personnel are required to hold a vocational skill level certificate for gas appliance installation and maintenance, which includes a QR code for verification [2]. - Users are advised to verify the credentials of installation personnel and avoid hiring unqualified individuals or attempting self-installation [2].