They are designed for air transport in the ventilation and air conditioning systems. Air ducts are made of galvanised steel with thickness from 0,5 mm to 1,5 mm. Depending on the customer requirements, they can be made of aluminium, copper sheet or painted by powder coating. Ducts are joined by flanges made of Europrofile E25, E30, depending on the perimeter. Installation of the air ducts is made with studs and hangers or with studs and bearing profile.