Carlisle HVAC Products began sealing and remediating ductwork to facilitate HVAC system efficiency almost 50 years ago. Encompassing the Hardcast brand of Duct Sealants, the Dynair brand of Duct Hardware, and the Nexus brand of Duct Flange Connecting System, Carlisle HVAC manufactures rolled duct sealants, mastics, adhesives, coatings and hardware as well as other accessories. As a one-stop shopping source for the contracting community through a network of wholesale distributors and OEM sheet metal manufacturers. Carlisle HVAC manufactures its products to exceed the highest performance and quality standards. To ensure the most energy-efficient HVAC system, choose Carlisle HVAC Products.