UNISOURCE SERIES ED. Style U expansion joints are elastomeric in both body and flange and are available in Neoprene, Hypalon, EPDM, Butyl, or fluoroelastomer Viton. Thinner in overall gauge than pressure piping expansion joints to protect thin wall duct systems.
Standard circular expansion joints have integral duck and rubber flanges, drilled to order. Rectangular style also incorporates rubber flanges, utilizing square corners and special drilling. “Continuous corners” eliminate splices through the body of the expansion joint near the corners. The inherent flexibility of rubber provides long service life even in applications of high vibration or flutter. Style “U”, a U-joint without arch, designed for normal ducting movements. Series ED expansion joints require metallic backing rings or bars. Typical retaining bars are made of 3/8” x 2” A-36 chamfered or round ed edge bar stock.