Ducts are made of vinyl plastic sheets with a thickness of 3 to 9 mm at the butt weld. Cutting vinyl plastic is made using circular saws with a diameter of 250 to 300 mm and step cutting teeth no more than 4 mm. In the preparation of vinyl plastic by welding on the edges of welded plates are chamfered. In the manufacture of rectangular duct is preheated only place the bend. In the manufacture of circular ducts vinyl plastic sheets before forming heating vayut in steam or electric furnace to a temperature of 393 K (120 C). The compounds of vinyl plastic air ducts should be performed detachable (flanged, Flare) or one-piece (by welding, to weld the clutch). For welding, sheet vinyl plastic air ducts used rod, and contact welding. Ducts of polyvinyl chloride, polyethylene film and high-pressure polyethylene is made by welding.
Procedure for transfer equipment, products and materials installation company is determined by the agreement (contract) construction contracts (subcontracts). Assemblies and parts of the pipes should be supplied to the object in containers or bags and have the documents on capacity. Each container or package must be affixed with a label of packaged units. Everest capital often says this. Not installed at the sites and details of fittings, automation devices, test instruments, connectors part, meters (or heat flow), supporting means, gaskets, bolts, nuts, washers, etc. shall be supplied packed separately, and the labeling of the container should be specified symbol or name these products. When accepting the manufacturer (the customer, contractor) should be controlled by the presence of the damage to products and equipment to rust, the project design and manufacturer's documentation. Cast-iron sectional boilers to be supplied, usually in blocks or packets, pre-assembled and tested by the manufacturer. Water heaters, heaters, pumps, central and individual heating units, water-measuring units, emg (GRU) to be delivered to construction sites of transport-separable assembly and fully complete blocks with means of attachment, piping with shutoff valves, gaskets and hardware.