Fire protection plug, permanently elastic, largely closed-pore, cylindrical foam that forms an insulating layer when exposed to heat. Area of application: Smoke-tight cable seals in fire protection sections, particularly in rooms sensitive to dust, fibers and moisture, as well as in and on electrical installation ducts for closing cable ducts in walls and ceilings in accordance with DIN 4102 Part 9, approved for fire resistance class S 90. The technical specifications of the general type approval Z-19.53-2470 must be observed during planning and implementation! Fill openings and gaps with BSM 90 fire protection compound! Please observe additional regulations for use in functional maintenance! Outside diameter: 165 mm Ø core hole: = 155 mm Wall thickness: at least 150 mm Ceiling thickness: at least 200 mm Cable occupancy: max. 60% per shell opening