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Design and measurement: Determine the ceiling height, shape, and lamp position based on the room layout, accurately measure the length, width, and height data, and mark the pipeline direction to avoid conflicts.

Bounce line:

Use a laser leveling device to mark horizontal lines (usually 1050mm from the structural board surface) on the wall and top surfaces as elevation benchmarks.

Pop up the main keel position line (spacing ≤ 1000mm) and suspension rod positioning line (spacing 900-1200mm, first-row distance from wall ＜ 300mm).

Key controls: horizontal line accuracy, parallel arrangement of the main keel in the longitudinal direction of the room, and arching of large-area ceilings according to the short span of 1/200-1/300.