What is the minimum requirement for a direct connect to a fire flue liner?

The minimum requirement for a direct connect to a flue liner involves using a stainless steel connector. Stainless steel is widely recognized for its durability and resistance to corrosion, especially in high-temperature environments typical of venting systems. Given its structural integrity and ability to withstand the harsh byproducts of combustion, stainless steel connectors ensure a safe and effective connection to the flue liner.

Utilizing stainless steel not only complies with industry standards but also enhances the longevity and reliability of the venting system. This is crucial for preventing leaks and ensuring that flue gases are safely channeled outside of the structure.

In contrast, other materials like plastic connectors may not be rated for high temperatures, making them unsuitable for use in a direct connection to a fire flue liner. Additionally, while vertical installations or specific lengths of installation, such as 10 feet, might be relevant in certain contexts, they do not specify the type of connector needed for safety and efficiency, which is why they are not the correct choice in this case. Furthermore, adapters for flexible ducts are generally not standard requirements for direct connections to flue liners, as they often lead to complications with airflow and efficiency in venting.