What is a key feature of a forced-draft venting system?

A key feature of a forced-draft venting system is that it uses a fan to remove gases under positive pressure. This ventilation method actively pushes flue gases out of the building, ensuring efficient removal and reducing the likelihood of backdrafts or gas leaks. The use of positive pressure means that the system can effectively overcome resistance in the venting path, which is particularly important in applications where traditional natural draft systems may not function adequately due to long vent runs, changes in elevation, or other factors that impede proper airflow.

In contrast, natural drafts rely on temperature differences between the inside and outside of a flue to create upward movement of gases and do not utilize a fan, making it less effective in certain scenarios, especially in larger or complex installations. The option that suggests using a fan to create negative pressure refers to a different type of venting technology that focuses on pulling exhaust gases, which is not the defining characteristic of forced-draft systems. Lastly, stating that the system does not require mechanical components would not align with the definition of forced-draft venting, which explicitly relies on mechanical fans to function effectively.