Ventilation systems are designed to distribute air in ventilation of flats, houses and utility buildings. The company AWETA offers five sizes channel systems and fittings. There are two systems of flat, measuring 55×110 mm and 75×150 mm; and three round Ø100, Ø125 and Ø150. All channels have a length of 0.5 m, 1.0 m or 1.5 m Group connectors are all necessary to complete the assembly of parts, such as connectors, elbows, tees, reducers (also multi-stage), handles, flanges and end. Channels are manufactured from PVC, couplings and fittings – with ABS. A new systems are flexible ducts.