Projectors generally use inversion lifting, at the bottom of the machine with a dedicated lifting holes for coupling with the hanger , the hanger is very common, and there are a variety of models suitable for universal hanger . Lifting the models must have inverted mirror image function , some domestic chip LCD projector does not support mirroring function, this model uses dress hanger , relatively rare on the market , the production of the projector manufacturers usually placed . Machine -made chip LCD projector heavier , between 5-8 kg, optional hanger and screws to attach importance when strength , quality time , or because the screw is screwed into deep enough and fall accident had occurred , but some ill-considered domestic machine designed lifting holes are arranged at the bottom of the circuit or wire , screws screwed too deep can cause damage or short circuit boards . Due to the special nature of Kara OK place , big room sound vibrations , especially on bass , along with projector noise while lifting slightly shaking, the ceiling hanger join the long run will screw loose, hanging wooden ceiling fixed frame is generally not a danger , and precast concrete ceiling hanger directly with the expansion of the use of metal nails expansion approach is dangerous, there are reports of the projector from falling down , using a large enough wedge instead of metal nails may to some extent prevent expansion dangerous occurrence .zjSservice manual download site