Finlandia / Harvia Part # FH91 or ZSL-378 Rock Guard for top of Heater is a purpose-built safety and performance accessory that keeps sauna stones securely in place on your heater. Shaped to match the top profile of compatible Finlandia and Harvia units, this guard forms a protective perimeter that helps prevent rocks from shifting, tipping, or falling when the heater is heating up or when water is ladled onto the stones. Its durable, heat-resistant construction is designed to endure continuous high temperatures and frequent use, maintaining its shape and stability over time. By holding the stone bed neatly contained, the FH91 / ZSL-378 also supports more even airflow through the rocks, promoting efficient heat transfer and a consistent sauna climate. It’s a simple, effective upgrade for restoring or maintaining a safe, well-performing heater top.
Finlandia / Harvia Part # FH91 or ZSL-378 Rock Guard for top of Heater is a purpose-built safety and performance accessory that keeps sauna stones securely in place on your heater. Shaped to match the top profile of compatible Finlandia and Harvia units, this guard forms a protective perimeter that helps prevent rocks from shifting, tipping, or falling when the heater is heating up or when water is ladled onto the stones. Its durable, heat-resistant construction is designed to endure continuous high temperatures and frequent use, maintaining its shape and stability over time. By holding the stone bed neatly contained, the FH91 / ZSL-378 also supports more even airflow through the rocks, promoting efficient heat transfer and a consistent sauna climate. It’s a simple, effective upgrade for restoring or maintaining a safe, well-performing heater top.