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HBT-221 rectangular bubble-tight damper is available in larger sizes up to 48 inches by 52 inches in a single section. This allows larger openings to be filled with one pre-engineered damper to provide zero leakage rather than a multi-section assembly that can add a significant amount of pressure to the system. Larger-size dampers can be configured with a single actuator versus two actuators found in a multi-section damper assembly. The product features a blade seal mechanically fastened to the blade that is field replaceable and a flanged damper frame for easy mounting.