Revolutionary Air Mixing Technology- No more cold feet! Saunum's patented air blending system mixes cooler, oxygen-rich air from the floor with hot, oxygen-poor air from the ceiling and distributes it evenly throughout the sauna. This provides a more balanced temperature and better breathability, ensuring comfort from head to toe. Scandinavian Design- Featuring an elegant black steel finish, Saunum blends modern Scandinavian aesthetics with premium-quality materials. Massive Stone Capacity- The Air L 15 boasts a 198-pound stone capacity (6 boxes required, sold separately), resulting in softer, more even heat and the ability to produce luxurious steam-a hallmark of true Nordic sauna tradition. Himalayan Salt Reservoir- Genuine Himalayan salt spheres are positioned in the air stream to disperse beneficial salt ions throughout the sauna, enhancing respiratory and skin health. Designed for sauna rooms from459 to 741 cu. ft. UL-listedfor safety and certified performance. Note:Required control and sauna stones (198 lbs / 6 boxes) sold separately.