What is the minimum size a connector should be?

The minimum size a connector should be is determined by the flue collar of the appliance. This is crucial because the connector must match or exceed the size of the flue collar to ensure proper venting of combustion gases. If the connector is smaller than the flue collar, it can lead to inadequate drafting and potential backdrafting of harmful gases, which poses a safety hazard.

By adhering to the flue collar size, you ensure that the connector is properly sized to facilitate the flow of exhaust gases from the appliance to the outside atmosphere. Choosing a size based on the appliance’s specifications guarantees that the venting system works efficiently and safely. In contrast, arbitrary sizes such as 4 inches, 3 inches, or 6 inches might not align with the specific requirements of the appliance, which is critical for compliance with safety standards and operational efficiency.