What is a primary advantage of using double wall connectors?

The primary advantage of using double wall connectors lies in their ability to be listed for close clearances. This means they can be installed in tighter spaces near combustible materials compared to single wall connectors, which require greater distances from such materials to prevent the risk of fire. The double wall design incorporates an airspace between the inner and outer walls, which helps to insulate the flue gases and reduce the surface temperature of the outer wall. This feature not only enhances safety by minimizing the risk of ignition of surrounding materials but also allows for increased flexibility in installation options, particularly in situations where space is limited.

The efficiency of double wall connectors in this regard is integral to building codes and safety regulations that help ensure safe operation and compliance with installation standards. Other attributes that might be considered, such as cost, installation length, or aesthetic options, are secondary to the critical safety advantage offered by their clearance capabilities.