... when constructing to install pipeline, cable, TV & Phone wiring and Computer Network line, it has to cut and partly damage partition ... pipe, conduit, power line, Television line, Phone line, Computer Network line and etc. along horizontal and vertical direction. As a whole it is convenient ... no crack Sound insulation 40dB 43dB Max fire resisitance A grade 60min 188 min Single point hanging force ≥800N ...