The wind pipe shall not be connected with S type cutting, C type right angle cutting and vertical joint angle cutting. The air cleanliness class is 1 to 5 level wind pipe shall not use stud bite.
The flange rivet spacing of the duct of the air conditioning system shall be less than 100 mm, and the distance between the rivets of the air duct flange of air cleaning grade 1~5 shall be less than 65mm.
Reinforcing frame or reinforcing rib shall not be installed in air duct.
The cleaning liquid should be used to remove the oil stain and dust accumulation on the surface of the pipe before the duct is processed. The cleaning liquid shall be a neutral detergent that does not damage the surface of the sheet, does not produce dust after drying and has no harm to the human body.
Ventilation pipe production should be used after cleaning fluid cleaning, cleaning after the white cloth wipe check to meet the requirements, the phenolic plate, should be promptly sealed.
The inner wall of the color coated steel pipe shall be smooth, and the sheet shall not be damaged during processing, and the damaged parts shall be coated with epoxy resin.
The four corners of the wind pipe, such as the bite joint, the riveted joint and the flange flanging, shall be sealed by the coating sealant or other sealing measures according to the design and cleanliness grade requirements. Sealing material should adopt isobutyl rubber, chloroprene rubber, modified silica gel as the base material. The sealing surface of the joint of the wind pipe plate shall be located on the positive pressure side of the air duct wall.
The wind pipe production site should be relatively closed, and the site should be paved with soft materials which are not easy to generate dust
The duct shall be longitudinally jointed, fiberglass ventilated, and shall not have transverse joints.
Pipe connections, bolts, nuts, washers and rivets shall be galvanized or other anticorrosive measures, and no core rivets shall be used.
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