Greenheck’s HBT-221 rectangular bubble-tight damper is now available in larger sizes up to 48 in. x 52 in. 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. In addition, larger-size HBT-221 dampers can be configured with a single actuator versus two actuators found in a multi-section damper assembly.

Heavy-duty model HBT-221 features a blade seal mechanically fastened to the blade that is field replaceable and a flanged damper frame for easy mounting. The HBT-221 is available with a full range of electric, pneumatic or manual actuator options. Each damper unit is factory-tested to ensure bubble-tight leakage performance per AMCA 500-D up to 10 in. wg (2.5 kPa) prior to shipping and meets ASME AG-1, Class 0A requirements. Designed for isolation or decontamination applications where leakage is critical, the HBT-221 damper is ideal for medical facilities, universities, test laboratories, and food processing.

Greenheck, the worldwide leader in manufacturing and distributing air movement, conditioning, and control equipment, offers the most UL certified dampers and the largest selection of AMCA licensed dampers in the industry.

For more information visit www.greenheck.com or contact Greenheck, P.O. Box 410, Schofield, WI 54476-0410, (715) 359-6171, FAX (715) 355-2399.