S-type, C-type right angle and vertical joint angle shall not be used for air duct connection. The air duct with air cleanliness level of 1-5 shall not adopt snap bite.
The distance between flange rivets of air duct of purification air conditioning system should be less than 100 mm, and the distance between flange rivets of air duct with air cleanliness grade of 1-5 should be less than 65 mm.
Reinforcement frame or reinforcement bar shall not be set in the air duct.
Before the air duct is processed, the cleaning solution should be used to remove the oil and dust on the surface of the board. The cleaning solution should be a neutral detergent that does not damage the surface of the board, does not produce dust after drying, and does not harm the human body.
After the ventilation pipe is manufactured, it should be cleaned with cleaning solution. After cleaning, it should be wiped with white silk cloth. After it meets the requirements, the phenolic board should be sealed in time.
The inner wall of air duct of color coated steel plate shall be smooth; the coating shall not be damaged during plate processing, and the damaged part shall be coated with epoxy resin.
The undercut joint, riveting joint and flange flanging four corner joint of air duct shall be sealed with sealant or other sealing measures according to the design and cleanliness requirements. The sealing materials should be isobutyl rubber, chloroprene rubber, modified silica gel, etc. The sealing surface of the connecting seam of the air duct plate shall be set on the positive pressure side of the air duct wall
The air duct production site should be relatively closed, and the production site should be paved with soft materials that are not easy to produce dust
The longitudinal joints of air duct shall be reduced, and the FRP ventilation duct shall not have transverse joints.
Galvanized or other anti-corrosion measures shall be adopted for connecting bolts, nuts, washers and rivets of air duct processing, and blind rivets shall not be used.