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Greenheck has expanded its line of isolation dampers with the new that is rated to 20 in. wg (5 kPa). Each HBT-321 damper unit is factory-tested to ensure bubble-tight leakage performance per AMCA 500-D prior to shipping and also meets ASME AG-1, Class 0A requirements.

The  can withstand velocities up to 4,000 fpm and a temperature range from -40 °F to 250 °F. Available in sizes up to 48 in. x 42 in., the HBT-321 allows larger openings to be filled with one pre-engineered damper to provide zero leakage rather than a multi-section assembly that can add significant pressure drop to the system. In addition, HBT-321 dampers can be supplied with a wide range of factory-installed actuators including electric, pneumatic, or manual actuator options.

 features a fully welded frame, full-length axles, a field-replaceable sweep-style blade seal mechanically fastened to the blade, and a flanged damper frame for easy mounting. Designed for isolation or decontamination applications where leakage is critical, Greenheck’s HBT-321 bubble-tight damper is ideal for clean rooms, chemical and treatment plants, data centers, medical facilities, microelectronic manufacturing, bag in bag out (BIBO) filtration, laboratories, and testing facilities.

Greenheck, the worldwide leader in manufacturing air movement, control, conditioning, and distribution equipment, offers the largest selection of isolation dampers in the industry.

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Greenheck manufactures commercial, institutional and industrial products including fans and ventilators, centrifugal and vane axial fans, laboratory exhaust systems, energy recovery ventilators, make-up air, dampers, and louvers.