1 - reinforced concrete ceiling with o  thickness B = min. 150 mm
2 - plastic pipe, diameter "D" and thickness  pipe wall "t"
3 - plastic pipe bend 87.5 °, diameter  D1 and wall thickness t1
4 - Multitube fireproof intumescent tape [hxs] mm, positioned  inside the floor, at a distance of 15 ± 5 mm to the underside of the floor
5 - electrically clamped band or adhesive tape
6 - space filled with mortar cement, approx. 25 mm