HVAC METALS builds rectangular, round, and oval ductwork in both single- and double-wall designs, using galvanized steel, stainless steel, copper, aluminum, PCD, and galvanneal. Our duct systems are made for long-lasting performance, tight air seals, and full compliance with New Jersey HVAC codes. While many contractors choose aluminum for lighter installs or flexible duct for tight areas, galvanized steel continues to be the strongest and most dependable choice for residential and commercial projects.