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Rectangular Bubble-Tight Dampers for lower pressure drops.

Press Release Summary:

Square blade, model HBT-221, commercial grade rectangular bubble-tight damper. Features replaceable blades and flanged frame for mounting. Product tested to AMCA 500-D up to 10 in. wg (2.5 kPa). Available with manual, pneumatic or electric operation. Applications include isolation or decontamination in medical facilities, test laboratories and food processing plants.

Original Press Release:

Greenheck Introduces Rectangular Bubble-Tight Damper

Greenheck Model HBT-221 is the industry’s first commercial grade rectangular bubble-tight damper with square blades. True rectangular blade design allows for lower pressure drop than bubble-tight dampers with circular or oval blade designs. Model HBT-221 features a blade seal mechanically fastened to the blade that is field replaceable and a flanged damper frame for easy mounting, and 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. Designed for isolation or decontamination applications, 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 about Greenheck products, visit or contact Greenheck, P.O. Box 410, Schofield, WI 54476-0410, (715) 359-6171, FAX (715) 355-2399.

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