Galvanized Sheet Metal Duct from The Duct Shop is manufactured from high quality galvanized steel in 3 foot lengths for easy handling. One end of each piece is crimped for easy fitting of consecutive joints or to sheet metal fittings and flexible duct. The seam on our galvanized sheet metal duct is formed on a snap-lock machine which allows ease of assembly on your job site. Just snap the seam together and install to your adjoining items.
Installation Tip — To snap the seam together, start at one end and work your way toward the other end, making sure you hear the snap of the seam as it goes together. This snap feature will prevent the seam from coming apart. We recommend that you seal this seam with a duct sealant to prevent air leakage. This will improve the energy efficiency of your system and lower your utility bills. When attaching to sheet metal fittings, slide the crimped end of the duct into the straight end of the fitting and secure with sheet metal screws at about 4" on center. We also recommend that you seal this joint with a duct sealant. All sheet metal duct used for Supply Air in your heating or air conditioning system should be insulated on the outside by wrapping a fiberglass insulation blanket around the sheet metal duct.