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2-Person Home Sauna · Infrared + Traditional Steam + Red Light
The Finnmark FD-4 Trinity is a thoughtfully engineered, multi-modal sauna designed for those who want versatility without compromise. Combining full-spectrum infrared heat, a traditional Finnish steam heater, and integrated red light therapy, it offers a comprehensive wellness experience within a refined residential footprint.
This is sauna design expanded — intentional, flexible, and deeply restorative.
the FD-4 Trinity by Finnmark
Why We Selected the FD-4 Trinity
We selected the FD-4 Trinity for its rare ability to integrate multiple proven heat and light therapies into a single, well-executed system. Finnmark’s commitment to UL-listed components, material integrity, and real-world usability aligns with our belief that advanced wellness should be purposeful, not excessive.
For clients seeking one solution that supports a range of recovery rituals, the Trinity stands apart.
The Experience
The Trinity adapts to how your body feels, day to day. Choose gentle infrared warmth, classic high-heat steam, or a layered session that combines modalities. The cabin warms efficiently, surrounds the body evenly, and invites longer, more comfortable sessions without overwhelming intensity.
Inside, Western red cedar creates a clean, calming environment, while tiered bench seating allows for varied positioning. Integrated lighting and audio complete the experience, transforming the space into a personal wellness retreat rather than a piece of equipment.
Designed to Support Recovery & Longevity
Infrared and traditional sauna bathing support recovery in complementary ways. Infrared heat gently penetrates beneath the skin’s surface, encouraging circulation and muscle relaxation at lower ambient temperatures. Traditional steam sauna sessions provide higher heat and humidity, often used for deep relaxation and post-exertion recovery.
Integrated red light therapy adds an additional layer of support by delivering targeted light exposure that may complement skin health and recovery routines. When used consistently, these modalities may support relaxation, recovery, and resilience as part of a balanced wellness lifestyle.
“No medical claims are made. Individual results may vary.”
Model
Materials
Heating Systems
Electrical
Performance
Dimensions
Additional Specs
FD-4 Dimensions and Diagrams
Finnmark Safety Certificate
FD-4 IOM
FD-4 WIFI Controller Manual
EMF TEST LOG
Harvia Stones
The FD-4 Trinity ships free within the contiguous United States and is delivered via scheduled freight service. Delivery is curbside only, with the sauna arriving on a wooden pallet and lowered to ground level by the carrier.
Customers are typically contacted prior to shipment to coordinate delivery details and confirm site readiness. Assembly is straightforward with included components and instructions.
The Finnmark FD-4 Trinity includes a limited manufacturer’s warranty and ETL certification. Core Human Health provides guidance before and after purchase to support planning, setup considerations, and long-term care.
Our role is to ensure your sauna investment is informed, intentional, and supported.
“Invest in a recovery ritual you’ll return to.”
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2-Person Home Sauna · Infrared + Traditional Steam + Red Light
The Finnmark FD-4 Trinity is a thoughtfully engineered, multi-modal sauna designed for those who want versatility without compromise. Combining full-spectrum infrared heat, a traditional Finnish steam heater, and integrated red light therapy, it offers a comprehensive wellness experience within a refined residential footprint.
This is sauna design expanded — intentional, flexible, and deeply restorative.