1. Height of first-class suspended ceiling: generally, it is 120- 150 mm from the top. In general, the ceiling edge is 5CM thick (it looks 5CM). However, due to the need to make reflective lamp troughs sometimes, the space for installing lamps should be reserved, so the first-class ceiling is generally 120-65438. Generally, the thickness of the first-class ceiling with light trough is 6cm.

2, 3, secondary ceiling height: the secondary ceiling height is generally lowered by 20cm, depending on your height. If the story is very high, the thickness of each story can be increased. The height of the floor can be slightly higher than 2 ~ 3 cm on each floor, but not too little, otherwise the lamp tube will not fit in. If no lights are installed, 5 cm can be hoisted at each level.