In what situation are chimney connectors allowed to pass through a combustible wall or partition?

Chimney connectors are designed to transport flue gases safely from heating appliances to the chimney or venting system. When passing through a combustible wall or partition, safety and proper installation methods become paramount to prevent fire hazards.

The use of a type L vent is crucial in this scenario because type L vents are specifically constructed for high-temperature applications and are insulated to prevent any heat transfer that could ignite surrounding combustible materials. Their design features allow them to safely pass through combustible walls, minimizing the risk of fire.

The use of a thimble, while relevant in certain contexts for installation, does not directly ensure the safety of passing through combustible materials like a type L vent does. Similarly, type B vents, while they may have certain allowances, are primarily meant for venting gases from specific appliances and may not be safe for passing through combustible structures without additional protections. While professional installation is always recommended for safety and compliance, the specific requirements regarding the design of the venting system ultimately determine if it can safely pass through combustible materials.