Hardcast’s industry-leading, long-lasting duct sealing solutions- liquid duct sealants, mastic tape, adhesives, and coatings ensure that your HVAC system ductwork complies to the latest Energy and Mechanical codes.Also manufacturers of DynAir and Nexus providing a full line of top-quality hardware that offers premium performance, increasing installation efficiency and savings, reducing noise vibration and balancing airflow for commercial and residential structures at a consistent level. These products are available in G-90 steel and stainless steel.