Air duct shall not be connected by S type cuttings, C right angle cuttings and vertical joint angle cuttings. The air hose with air cleaning grade 1~5 is not allowed to use snap snap.
The distance between the flange and rivet of the air duct of the purifying air conditioning system should be less than 100 mm, and that between the flange and rivet of the air duct with the air purifying grade of 1-5 should be less than 65 mm.
No reinforcement box or reinforcement should be installed in the wind pipe.
Cleaning fluid should be used to remove oil and dust on the surface of sheet metal before air duct processing. Cleaning fluid should be used as a neutral cleaner which is harmless to the surface of sheet metal, does not produce dust after drying, and does not harm to human body.
Ventilation pipes should be cleaned with cleaning fluid after production. After cleaning, the phenolic board should be sealed in time after it has been wiped and inspected by white silk cloth.
The inner wall of the color coated steel pipe shall be smooth; the coating shall not be damaged when the plate is processed, and the damaged part shall be coated with epoxy resin.
The bite seam, rivet seam and flange flange flange flange flange corner crack should be sealed by sealing glue or other sealing measures according to the design and cleanliness grade requirements. Sealing materials should be made of isobutyl rubber, neoprene, modified silica gel and other substrates. The sealing surface of the joint of the wind pipe plate should be located on the positive pressure side of the wind pipe wall.
The production area of the wind pipe should be relatively closed, and the production site should be paved with soft materials which are not easy to produce dust.
The longitudinal joints and FRP ventilation ducts should be reduced and no transverse joints should be allowed.
Connection bolts, nuts, washers and rivets for air duct processing shall be galvanized or other anticorrosive measures, and core-pulling rivets shall not be used.