Abstract: A spiral pipe has an integrated radial flange. A machine for forming such a flange comprises a rotor which rotates and a flange roller mechanism connected to the rotor via slides. As the rotor rotates, the flange roller mechanism moves radially via the slides to form an integrated flange on an end portion of the spiral pipe.

Abstract: An air duct connector is used to create an air-tight connection for duct work. A method of using the air duct connector includes cutting a strip of an air duct connection gasket along a first start edge. The strip is adhesively attached around a metal connector band such that the air duct connection gasket fully encircles the metal connector band and an adhesive attachment is formed with an adhesive backing. The strip is cut along a second close edge which matches the first start edge and the strip is positioned such that the first start edge mates together with the second close edge at a sealing seam. The air duct connection gasket includes a first sheet section extending generally in a planar sheet between a first side edge and a first central edge. The first sheet section has a first sheet width which is substantially wider than a first sheet thickness. A first sealing rib extends longitudinally on a front face of the first sheet section and defines a flexible fin.

Abstract: A duct vane assembly has a rail for supporting a flow diverting vane perpendicularly therefrom. The rail has at least one upstanding tab for each vane which is adapted for insertion longitudinally into a slot defined by a lateral strap formed on the vane adjacent its end. A finger on the tab projects into an opening on the vane adjacent the strap to affirmatively retain the vane in connected relation to the rail.

Abstract: A damper to be pivotally mounted and eventually clamped in a cylindrical air duct includes a circular damper blade, a first pivot pin extending integrally radially outwardly from the blade, a damper clip mounted on the opposite side of the blade to have a slidably mounted second pivot pin extending radially outwardly from the blade on the same diameter as the first pin. The blade is provided with a pair of parallel, spaced-apart and upstanding positioning beads situated to positively position the damper clip and the axis of the second pivot pin. A pair of parallel, spaced-apart elongate, upstanding stiffening beads are spaced from and parallel to the diametrical axes of the positioning pins.

Abstract: A rail for mounting sheet metal turning vanes includes a sheet and integral vane guides extending generally perpendicular away from the plane of the sheet. Each vane guide is a plate slit from the sheet except for one edge along which the plate is bent. The plate is adapted for positioning adjacent to a wall of the vane. An access aperture, partially located in the sheet and partially located in the plate, is adapted to allow access to a portion of the vane wall for contact by a striking tool. A blow from the tool splits the sheet metal vane wall to form tabs which are folded through the aperture, which securely attach the wall to the rail.