The Saunum Air 7 Sauna Heater Package (Model AIR 7 CSB PKG) delivers a premium sauna experience with patented air‑mixing technology, Himalayan salt ion infusion, and Scandinavian-style design. Air Mixing Technology: draws hot, oxygen-poor air from the ceiling and blends it with cooler, oxygen-rich air at floor level for even heat and comfort. Large stone capacity: up to 132 lbs (60 kg) for softer, more even heat and rich steam.