longitudinal seam

Duct Sealant—Longitudinal vs. Transverse Sealing Rectangular Ductwork: Choosing a Sealant with characteristics that match the Seam/Connection and the point of application Duct Sealant Characteristics Longitudinal Seam: a narrow lock that usually is long and continuous and moves in one direction. Covering this lock with more than 1/2“ width of sealant makes for a messy appearance and a waste […]