How must a gas dryer vent terminate?

A gas dryer vent needs to terminate outside the building to ensure that exhaust gases, which can include moisture and possible combustion products, are safely expelled away from living spaces. Terminating outside with a backdraft damper is essential because it allows for exhaust gases to escape while preventing outside air from entering the duct system when the dryer is not in operation. This design helps minimize the risk of backdrafting, which can occur when air flows backward into the vent and into the home.

In addition, not using screens at the termination point is crucial. Screens can become clogged with lint and debris, which can restrict airflow and create a fire hazard. Proper termination of the vent ensures efficient dryer operation and safety by allowing proper ventilation without obstruction.

While other options may suggest alternative terminating methods, they do not guarantee the same level of safety and efficiency that comes with the correct termination method using a backdraft damper outside without screens.