Harvia Linear WL585 Ls/rs Protective Sheath (side & Rear)Harvia Linear WL585 Ls rs Protective Sheath (side & Rear) The Harvia WL585 protective sheath is designed and approved for wood heated Harvia stoves (Harvia 22 RS and LS Linear 22 RS and LS). The protective sheath considerably reduces the safety distance to combustible materials in practice, this makes the stove fit in a smaller space. The protective sheath is attached to the stove and conforms to the shape of the stove, making the combination sleek.