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.

• Compatible with all HIVE models;
• Shorter heating period;
• Longer life expectancy for the heating elements;
• Less stones needed;
• Stainless steel.