What is the maximum percentage of rise for a single wall vent connector?

The maximum percentage of rise for a single wall vent connector is set at 75%. This means that when installing a vent connector, it is designed to rise no more than 75% of the horizontal distance it spans. This guideline is crucial for ensuring proper venting of combustion gases, as a steep rise can lead to inadequate draft and potential backdraft issues. When connectors ascend too steeply, it can impede the flow of gases, leading to improper functioning of the appliance being vented and increasing the risk of carbon monoxide buildup, which can be hazardous.

Standards are established to promote safe venting practices and maintain efficiency, helping to ensure that the entire system operates correctly and safely. Therefore, understanding the limit of a 75% rise is essential for HVAC professionals to adhere to building codes and safety regulations.