BHV ROUND INDUSTRIAL DUCT BHV industrial duct is offered in two standard constructions, round spiral lockseam and round longitudinal seam. The round spiral lockseam duct features an interlocking helical seam that runs the entire length of the duct. This exterior seam  construction adds structural strength and rigidity to the ductwork while maintaining a smooth, obstruction-free interior. The round longitudinal seam features a double lock (pipe lock) or a fully welded seam running its entire length. BHV spiral duct is available in diameters of 3 inches through 80 inches, in gauges 26 through 16, and in lengths to 20 feet. Longitudinal seam duct is available in diameters of 3 inches through 96 inches in 22 gauge through 1/4 inch. BHV industrial duct is offered in galvanized, PVC coated, black steel, stainless steel, and aluminum.

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