... scaffolding, indoor decorations, ducts, ventilating pipes, steel frames and cable trays 2- Electrical appliances: Such as, motors ... housings, electrical heaters, toasters, microwave oven enclosures and switch boxes. 3- Agricultural equipments:Barns, drying machines ... , greenhouses, water tanks, sheds, silos, agricultural implements and feeders 4- Transportation toolsContainers, under body panels, bus ...