Harvia WL450 - Full Protective Sheath for Harvia M3The Harvia protective shields for M3 and M3 SL wood heaters help reduce required clearances to nearby combustible materials, allowing for safer and more flexible sauna layouts. Designed for a precise fit, the shields attach securely to the back and sides of the stove. Made from durable, heat resistant materials, they are built to handle the high temperatures of sauna use.