The DELHI Backdraft Damper for BI Series Belt Drive Utility Blowers is designed to fit the outlet of BI series utility blowers, providing efficient backdraft protection. Constructed from durable 16-gauge aluminum, this gravity-activated damper ensures reliable operation. Its easy field installation makes it a convenient solution for enhancing blower performance and preventing unwanted airflow. Ideal for use in commercial and industrial HVAC systems, this backdraft damper helps maintain optimal system efficiency.