Harvia WL575 - Protective Sheath for Harvia Linear 22The Harvia WL575 protective sheath is designed for Harvia 22 and Linear 22 wood burning heaters. It reduces required clearances to combustible materials, allowing the heater to be installed in tighter spaces. The sheath attaches directly to the heater and follows its shape for a clean fit. Made from black painted steel, it is available as a full or one sided version that can be installed on either side of the stove.