What should be installed in the air intake and exhaust system to enhance safety?

Installing a damper that automatically closes when the system is not operating is a crucial safety measure in air intake and exhaust systems. This type of damper helps prevent backdrafts, which can allow harmful gases like carbon monoxide or other pollutants to enter the building when the system is off. By ensuring that the damper closes automatically, it helps maintain a safe indoor environment by controlling the airflow and reducing the risk of contaminants entering through the ventilation system.

Additionally, this automatic feature enhances energy efficiency by preventing unwanted thermal exchange when the system is not in use. While other options may contribute to overall system performance and safety, such as enabling air flow adjustments or filtering allergens, the specific functionality of an automatic damper is pivotal in directly safeguarding against hazardous backdrafts.