Harvia 21" W x 34" H Black Steel Protective Shealth for Linear Sauna Stoves and 22 SeriesThe Harvia WL550 protective sheath is designed and approved for wood heated Harvia wood burning heaters (Harvia 20 Pro SL Duo, 20 Boiler 20 SL Boiler). The protective sheath considerably reduces the safety distance to combustible materials in practice, this makes the wood burning heater fit in a smaller space. The protective sheath is attached to the wood burning heater and conforms to the shape of the wood burning heater, making the combination