To install an anti-backdraft device, first assess the chimney's existing components and local building codes. Select a compatible device designed for your chimney type (e.g., masonry or metal). Secure the base with metal screws or mortar, ensuring it sits flush against the flue. Install the device’s damper mechanism, aligning it with the flue opening. Test the device by closing the damper and verifying no smoke or odors enter the living space. Regularly inspect for wear and ensure the device remains functional during power outages.

Anti-backdraft devices are critical to preventing carbon monoxide (CO) leaks, which the CDC attributes to faulty ventilation in 400+ U.S. CO poisoning deaths annually. A 2021 NFPA study found 22% of home CO incidents involved improper chimney venting, often due to backdraft. Devices block reverse airflow by maintaining a positive pressure gradient, reducing the risk of toxic fumes entering homes. For example, a 2018 EPA report noted a 65% decrease in CO emissions in homes with properly installed anti-backdraft systems. Compliance with codes like NFPA 211 ensures structural integrity and safety, as improper installations can lead to fire hazards or condensation damage. Regular maintenance, including annual inspections, further enhances longevity and effectiveness.