VentAir Systemss is the manufacturer and supplier of Welded Ducts of CR / HR Sheet Material. VentAir Systemss offers air conditioning duct, pre fabricated duct, air conditioning duct, ventilation duct, exhaust duct and duct accessories. The Welded Ducts of CR / HR Sheet Material are obtained from coils. They are supplied in assembled position with MS Flanges at both ends of each duct piece. The ducts are used in a wide range of industrial and commercial applications.