Overview The Finnmark FD-4 Trinity is the world’s first 2-in-1 full-spectrum infrared and steam sauna combo — giving you the deep tissue penetration of full-spectrum infrared and the intense heat and humidity of a traditional steam sauna in a single unit. Switch between infrared mode (up to 170°F) and steam mode (up to 212°F) depending on your recovery goals, mood, or protocol. The FD-4 Trinity is the most versatile home sauna on the market, purpose-built for serious wellness practitioners who refuse to choose between modalities. Key Specifications Specification Detail Model FD-4 Trinity (2-in-1 combo) Heater Technology UL Listed Spectrum Plus™ (short-wave) + Spectrum Carbon 360° (long-wave) + Steam Generator Infrared Max Temp 170°F Steam Max Temp 212°F Heat-Up Time Under 1 hour (infrared); rapid steam generation Capacity 2 persons Spectrum Full-spectrum infrared (near, mid, far) + wet steam Use Cases Ideal for advanced recovery athletes who alternate between infrared sessions for deep tissue recovery and steam sessions for respiratory support and intense sweating. Ideal for biohackers and longevity practitioners who want maximum hormetic stress from both heat modalities in a single home unit. Ideal for couples with different sauna preferences — one partner prefers dry infrared, the other prefers wet steam; the FD-4 Trinity accommodates both. Ideal for contrast therapy protocols — use steam mode for maximum heat stress before a cold plunge, or infrared mode for gentler recovery sessions. Ideal for home wellness rooms where space and budget allow for only one sauna but both infrared and steam experiences are desired. How It Compares Unlike standalone infrared saunas or standalone steam rooms, the FD-4 Trinity combines both modalities in a single unit — eliminating the need to purchase two separate saunas. Compared to infrared-only models like the FD-2 or FD-3, the Trinity adds a steam generator that can reach 212°F for a traditional wet sauna experience. Compared to traditional steam rooms, the Trinity also delivers full-spectrum infrared (near, mid, far) for deeper tissue penetration and therapeutic benefits beyond surface-level sweating. No other home sauna in this price range offers both full-spectrum infrared and steam in a single cabin. Features 2-in-1 design: full-spectrum infrared + steam sauna in one unit UL Listed Spectrum Plus™ short-wave infrared heaters Spectrum Carbon 360° long-wave infrared panels Integrated steam generator — reaches up to 212°F Switch between infrared and steam modes Full-spectrum infrared coverage (near, mid, far) 2-person capacity with premium wood construction