Greenheck’s Model HBT-221 is the HVAC industry’s first commercial-grade rectangular bubble-tight damper, company officials say. The damper’s blade design allows for a lower pressure drop than ...
SCHOFIELD, Wis. — Greenheck’s HBT-221 rectangular bubble-tight damper is now available in larger sizes up to 48 by 52 inches in a single section. This allows larger openings to be filled with one ...
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