These heavy-duty tornado dampers prevent the collapse of the ductwork during inclement weather. Installed in ductwork or wall mounted near the exterior of a building, the dampers allow for air movement (intake or exhaust) during normal conditions but close when they sense the negative pressure caused by a tornado.
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DSX Access Systems - An Industry leader in the design and sales of integrated access control products from single-door to enterprise-wide systems. www.dsxinc.com