2.5h fire resistance limit
① 12mm thick Bote fireproof board
② Expansion bolt
③ M4 self-tapping screws, spacing about 200mm
④ Steel beam
⑤ L-shaped light steel keel 40×40×0.6mm
⑥ 50mm thick rock wool (bulk density 100kg/m³)
⑦ Rock wool 50mm thickness (bulk density 100kgm³)
