The term for a damper that prevents backflow in dryer exhaust duct systems is called?

A damper that prevents backflow in dryer exhaust duct systems is termed a backdraft damper. This device is specifically designed to allow airflow in one direction while blocking it in the opposite direction, effectively preventing air, and potentially lint or contaminants, from re-entering the dryer duct after the dryer has been turned off.

The primary function of a backdraft damper is to maintain the efficiency of the dryer by ensuring that exhaust air can exit freely, while also mitigating the risk of backflow, which could lead to overheating or fire hazards due to lint accumulation.

This makes it essential in dryer installations, where proper ventilation is crucial for both performance and safety. Other types of dampers, such as flue dampers, pressure dampers, and automatic dampers, serve different purposes; they may help regulate airflow in heating systems or operate based on specific conditions but do not specifically address the issue of backflow in dryer ducts.