What must be done to all vent connectors entering a chimney?

When vent connectors enter a chimney, it is essential that they are properly sealed or cemented to ensure that no flue gases escape into the living space. This is crucial for maintaining safety and efficiency in heating systems, as any leaks could pose safety risks and lead to the potential buildup of harmful gases within a structure. Using approved cement to secure the connection provides a durable, reliable seal that can withstand the temperature variations and condensation that occur in venting systems.

While other practices, such as insulation or support, are relevant in some contexts for different components of the heating system, the specific requirement for vent connectors entering a chimney focuses on the sealing aspect to ensure compliance with safety standards and regulations governing heating systems. Proper sealing also helps to maintain draft and improve the overall efficiency of the heating system.