HUUM Air TunnelAir Tunnel for HIVE Sauna Heaters Internal air tunnel for HUUM HIVE sauna heaters, speeds up sauna heating by 25% and extends the lifespan of heating elements. Internal air tunnel for HIVE sauna heaters speeds up sauna heating by 25% and extends the life span of heating elements. It is made of stainless steel and installed in the middle of the heater. When using the air tunnel, you need approximately 2 boxes fewer stones. Features Compatible with all
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