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, 30 kg less heater stones are needed.

• compatible with all HIVE electrical models
• shorter heating period
• longer life expectancy for the heating elements
• less stones needed
• stainless steel