What issues should be considered when installing ceiling pipes?

Reply to 1# zgj2405: The quality of the substrate on which ceiling panels, partitions, and wall studs are installed shall comply with the provisions of relevant current **standards； The horizontal lines around the ceiling should be at the same elevation, with an allowable deviation of no more than ±5 mm; the middle section should be arched ； Generally, the spacing between ceiling partitions and wall grilles should be 400–500 mm, with secure and reliable installation ； Wooden joists are used for ceiling installations; these joists must have consistent dimensions, be installed firmly and reliably, meet the load-bearing standards, and be straight and dry, free from contamination or decay. Wooden keel ceilings must be treated for fire resistance, and areas that are prone to moisture and insect damage must receive appropriate anti-corrosion or insect-proof treatment ； The light steel studs along the ceiling and floor should be in the correct positions and relatively vertical; the vertical studs should be accurately spaced and properly aligned, without any deformation, with the required amount of expansion space provided as specified, and the spacing between nails should meet the prescribed requirements ； Building decoration should properly address the conflict between aesthetic effects and safety in use. Non-flammable and flame-retardant materials should be actively employed, while materials that produce large amounts of smoke or toxic gases when burned should be avoided as much as possible, to ensure safe use, advanced technology, and reasonable cost ； The combustion performance grades of construction materials are divided into four categories, with A indicating non-flammability ； B1 flame retardancy ； B2 flammability ； B3 flammability. The top surface should preferably be of grade A; when grade B1 is used, necessary fireproofing measures must be taken ； Grade B1 can be used for wall surfaces, while when Grade B2 is used for walls, necessary fire protection measures must be taken ； B2 can be used for decorations and floors ； B3 must absolutely not be used.