US Duct - Vanstone Flange

This refers to a technique whereby a flange is used to mate 90-degree lips turned onto the pipe or duct component. In this method the flange is placed onto the pipe, the lip turned back and the flange left loose. Typically, the lip is ½” tall (or wide depending on your perspective) when the flanges are pulled together, the VanStoned lips of the pieces that are being connected, are pressed together to make a secure metal to metal connection. Because the flanges are loose on all pieces, alignment of the center-line of the components is easily accomplished. Standard Vanstone pipe lengths are a nominal 59”.