machines for spiral air ducts production. Spiral ducts are made of 137 mm and 140 mm wide spirally rolled steel sheet metal, using so-called tubeformers, i.e.
Finish-trim products, like air valves, diffusers, louvres, etc. clamps, threaded rod, support brackets, self-drilling screw, rivets and for duct fittings without seals - a sealing tape fire and smoke dampers, fire-rated air valves sound attenuators, flexible duct connectors, duct insulation Ducts and fittings, like bends, reducers, t-pieces, couplings, end caps, etc. Of course, spiral ductwork is more than just pipe and fittings, a complete ventilation system, depending on the project, may consist of the following components: Spiral ducting has female ends, therefore in order to connect two duct sections a male coupler needs to be used as a connection piece. Spiral duct is a rigid spirally wound tube manufactured of steel metal, most often galvanised steel, but also: stainless steel, aluminium or copper. By far the most popular ductwork types used for both residential and industrial ventilation systems are rigid spiral ducting and rectangular ducting. rigid spiral pipe is usually made of galvanized steel sheet flexible ducts often made of aluminium, polyester foil, etc. 
It can be also distinguished according to the material from which it’s made, e.g. Ventilation ductwork can be divided according to its shape, namely, circular, rectangular and oval (a compromise between rectangular and round ventilation ducts). Ventilation ducts are passages used to transport air – supply fresh outside air and remove stale indoor air.
A ventilation air duct is the basic element of the ventilation system.
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