What are the provisions for the manufacture and installation of galvanized air duct?

   Galvanized duct is thick galvanized steel sheet as the key raw material, after pressing, forming, mechanical processing and manufacturing have made on the spot is convenient, also have the design plan can be, is a traditional natural ventilation, central air conditioning pipe, moreover along with the technical development trend and made changes to previous hand-made today have all mechanical automation manufacturing here are galvanized duct production and installation of the regulation, duct insulation layer made of polyethylene foam insulation board, insulation foam plate relative density: 40 kg/cubic, 35 mm thick, temperature not less than 6 degrees (appearance), The edge bonding part of the heat insulation layer should be made of ladder or tenon groove structure and glued with epoxy resin. The outer surface is wrapped with aluminum foil cloth, and glued tightly with thermistor tape. There can be no condensation on the outer surface of the duct. Two, the installation of the air duct should be flat and straight, the main air duct installation bending is not more than 1.5 mm/m, the roughness is not more than mm/m. Three, the air duct and the air outlet are closely connected with the plastic hose with heat insulation layer. Four, air duct structure reinforcement: rectangular frame air duct circumference is greater than or equal to 630Mm and heat insulation wind duct circumference is greater than or equal to 800Mm, the distance of the pipe segment is above 1.1m should adopt structural reinforcement countermeasures. Five. The surface of air ducts and spare parts should be leveled, and the vertical joints should be separated; Bite seam should be inseparable, the total width is symmetrical. Welding should be done to check the appearance, there is no need to have vents, sand holes, welding tumors, cracks and other shortcomings, the deformation of thick steel plate after welding should be corrected. Six, ventilation pipe making general requirements: make duct before, the first is to check the application of raw materials to accord with the quality regulation, if there are any product conformity certificate or quality assessment document, if there is no proof should be described in appearance inspection, and shall accord with the following provisions: 1, the raw material can not be because of a defect resulting in a decrease of the compressive strength of manufactured goods or harm its application efficiency. 2, channel should be such as type, symmetrical, there should not be cracks, bubbles, holes and other disadvantages harmful to quality. 3, the surface of the plate should be leveled, thin and thick evenly, no convex and concave and significant squeeze, and can not have cracks, sand holes, scab and thorns and rust. 7. All right-angle turns in the air duct system software are installed with silencing elbows, and under the silencing elbows are galvanized stainless steel plates for drainage. Eight, the production of metal material air duct and pipe material, diameter or foreign minister allowable error: less than or equal to 300mm is -mm; More than 300mm is -3mm. Flanges are made in which the inner diameter of the annular flange or the inner edge of the rectangular frame flange is allowable error of +3mm, and the roughness shall not exceed 3mm. 9. The air duct is pressed by mechanical equipment, which is neat and tight, and the inner surface of the socket is covered with large structural glue.