When connecting to the flue collar, what is true about the connector's size?

When connecting a vent connector to a flue collar, it is crucial that the connector does not reduce in size compared to the flue collar. This is because a connector that is smaller than the flue collar can cause a restriction in the flow of combustion gases. Such a restriction can lead to improper venting, which increases the risk of backdrafting, carbon monoxide buildup, and potential hazardous conditions.

A connector that is the same size or larger than the flue collar ensures a smooth transition for exhaust gases, preventing turbulence that could lead to inefficiencies or safety risks. This principle is critical for maintaining proper pressure in the venting system and ensuring that appliances operate efficiently and safely.

Therefore, it is essential that the vent connector must not be smaller than the flue collar to comply with safety standards and regulations set forth in the North Carolina Mechanical Code.