Line feedthrough for feeding lines through a component

A line penetration for routing a line through a building part, comprising:

• a first lamellar element with a hollow-cylindrical first base part for receiving the line in a straight-through line opening, and with first circumferential lamellas, which extend outwardly transverse to an axial direction of the first hollow-cylindrical base part;
• a second lamellar element with a hollow-cylindrical second base part for arrangement in a passage opening of the building part, and with second circumferential lamellas, which extend inwardly transverse to an axial direction of the straight-through line opening, wherein the first and second circumferential lamellas mesh with one another, so that side faces of the first and second circumferential lamellas are impermeable to gas and bear slidingly on one another, and wherein ends of the first circumferential lamellas are spaced from the second hollow-cylindrical base part of the second lamellar element and ends of the second circumferential lamellas are spaced from the first hollow-cylindrical base part of the first lamellar element to allow the first and second circumferential lamellas to move relative to one another.