A fire-rated exhaust duct system comprising a modular configuration or structure. The fire-rated exhaust duct system comprises a plurality of exhaust duct sections. Each of the exhaust duct sections is configured to be joined or connected with other exhaust duct sections in the field or at an installation site, e.g. in building housing a kitchen facility or a laboratory facility to form longer sections or runs for exhaust duct system.

A modular conduit system is provided which includes at least one longitudinally extending shell component including an interior wall and an exterior wall, a first longitudinally extending edge, a second opposed longitudinally extending edge, an engagement tab located adjacent the first longitudinal edge, an engagement slot located adjacent the second longitudinally extending edge, the engagement slot having an enlarged portion and a narrow portion, the enlarged portion configured to receive an engagement tab from another longitudinally extending shell, the narrow portion configured to interfere with removal of the tab in a direction transverse to the slot. The longitudinally extending shells are combinable to form a conduit member which are themselves combinable to form a longitudinally extending array of conduit members. Swiveling elbow joints may be inserted between conduit members to provide changes in direction. Also provided are interengaging panels that cooperate to form containment barriers and which are configured to allow conduit members to pass into or out of the containment barriers.

Various ducts and methods of manufacture, use, and transport are disclosed. The present disclosure at least partially addresses at least one of the above. However, the present disclosure can prove useful to other technical areas. Therefore, the claims should not be construed as necessarily limited to addressing any of the above. An embodiment comprises a method comprising: accessing a duct comprising an outer portion and an inner portion, wherein the outer portion comprises an L-shaped segment comprising a first end portion and a second end portion, wherein the first end portion comprises a first winglet extending therefrom, wherein the second end portion comprises a second winglet extending therefrom, wherein the first winglet and the second winglet contact the inner portion such that a channel is defined between the L-shaped segment and the inner portion; conducting a fluid through the inner portion.

A panel for self-supporting ducts, in particular air-conditioning ducts, made up of a core of mineral wool or the like, covered on its external face and on its internal face with an exterior covering and an interior covering, respectively. The interior covering includes or preferably is made up of an aluminium sheet a layer of a glass fabric or a layer of a glass web. The exterior covering includes the succession of a first layer of plastics material, an aluminium sheet, and a second layer of plastics material. The layers of plastics material are bonded to the aluminium sheet directly or via an adhesive. The exterior covering is bonded to the external surface of the core by glue.

A plastic product includes a first component made of plastic and a second component made of plastic. The first component includes a first joint surface. The second component includes a second joint surface joined to the first joint surface. The first component includes a contact surface that is located on a side opposite to the first joint surface in a facing direction. The contact surface includes a general portion and a protruding portion. The first component includes at least one recess in an outer side surface located between the first joint surface and the contact surface in a part in which the protruding portion is provided. The recess opens in the outer side surface.

Provided is a flanged member that has a tubular shape and includes a flange portion, the flanged member including: a cross-section changing portion of which a cross-sectional shape changes along an axial direction of the flanged member, in which in any two cross-sections in the cross-section changing portion, a perimeter of one cross-section is 1.25 times or less a perimeter of the other cross-section.

A flanged duct blank has a male part defined by lead notches formed at each side of a leading end and has a female part defined by trail notches formed at each side of a trailing end. The male part includes a lock tab. The female part includes a leg part and a Z-bend. The Z-bend includes a leg part and a gap. The duct blank is repeatedly clamped and bent by a pivoting wiper to form a duct portion. The pivoting wiper includes a clench tool that has a retractable rib and a retractable roller. With the lock tab inserted into the Z-bend and the retractable rib engaged with the Z-bend, the retractable roller clenches the leg part over the lock tab to lock the male and female parts together in a duct seam.

A flanged duct blank has a male part defined by lead notches formed at each side of a leading end and has a female part defined by trail notches formed at each side of a trailing end. The male part includes a lock tab. The female part includes a leg part and a Z-bend. The Z-bend includes a leg part and a gap. The duct blank is repeatedly clamped and bent by a pivoting wiper to form a duct portion. The pivoting wiper includes a clench tool that has a retractable rib and a retractable roller. With the lock tab inserted into the Z-bend and the retractable rib engaged with the Z-bend, the retractable roller clenches the leg part over the lock tab to lock the male and female parts together in a duct seam.

A method for manufacturing a pipe with a rib, in which a rib portion formed inside a pipe portion includes bent portions in accordance with bending of the pipe portion or a twisted portion in accordance with twisting of the pipe portion, includes drawing out molten metal held in a furnace by using a starter, from a surface of the molten metal, and drawing up the molten metal through a shape defining member defining a sectional shape of the pipe with the rib to be cast, and cooling and solidifying the molten metal passed through the shape defining member and drawn up. The bent portions are formed by moving at least one of the starter and the shape defining member in a horizontal direction. The twisted portion is formed by rotating at least one of the starter and the shape defining member about an axis extending along a vertical direction.

Methods and apparatuses for additively manufactured tubular passages, additively manufactured manifolds, and additively manufactured heaters are provided.