Accessories for ducts comprise a wide range of elements helpful for ventilation system assembly. In the composition of accessories are packing elements - aluminum strips 50, 75 and 100 mm in thickness and wound on a roll of 50 m and temperature resistances from 80°C to 350°C, organo-silicon polymers, which fill the space between two elements jointed with nipples. The composition of accessories also includes the assembly system, which enables the suspending and coupling of ventilation elements. System foundations are metal clamping rings also made of shock absorbing EPDM rubber, as well as in an acid-resistant version. For suspending clamping rings threaded bars are used to assemble the girders with the help of TKN tinsmith's anvils, or fastened to trapezoid sheet metal with the help of TDH lifting rings. Another method of suspension is the use of "FB" perforated strips or SPEED LINK line suspensions.