When connecting two or more vent connectors into a common vent, what is the recommended position for the smaller connector?

In the context of venting systems, when connecting multiple vent connectors into a common vent, the smaller connector should be positioned at the highest level. This recommendation is crucial for ensuring that the flow of gases is facilitated efficiently and that there is adequate draft within the system.

Positioning the smaller vent connector at the highest level helps to prevent any potential backdrafts or condensation issues. By allowing the larger vent connector to maintain its primary flow path and positioning the smaller one above, you reduce the risk of the smaller connector being obstructed by any gravity-induced flow that may occur.

This arrangement promotes optimal ventilation, ensuring that combustion byproducts are effectively expelled from the system and that the pressure differentials are maintained correctly. It is a common best practice in the installation of venting systems to promote safety and efficiency.