Fire protection collar has stiff blocking lamella elements able to bend radially inwards from expandable swelling material via preferred bending points on inside of distance holders

摘要

The device has a stiff housing (4) that holds a line (3) with several radially inward distance holders (5) and holds swelling material (6) in the intervening gap. Stiff blocking lamella elements (8) are arranged so as to be able to bend radially inwards from the expandable swelling material via preferred bending points (7) on the inside of the distance holders.