Global Steam Sauna Cabinets Market Size, Share & Demand Report By Product Type (Single-Person, Two-Person, Multi-Person), By Material (Acrylic, Tempered Glass, Composite & Wood-Integrated), By Installation Type (Freestanding, Built-In/Modular), By End Use (Residential, Commercial Wellness Centers, Hospitality, Medical & Rehabilitation, Fitness Centers), By Distribution Channel (Direct Sales, Specialty Retail, E-Commerce, Institutional Sales), By Region & Segment Forecasts, 2025–2030