VentAir Systemss offers Galvanized Nuts / Bolts and Washers. VentAir Systemss offers air conditioning duct, pre fabricated duct, air conditioning duct, ventilation duct, exhaust duct and duct accessories. The Galvanized Nuts / Bolts and Washers are specially made for duct assembly and erection. These are used for duct flange jointing and duct hanging. The Galvanized Nuts / Bolts and Washers are mainly applicable in industrial and commercial areas.