
Finnmark FD-4 Trinity Infrared & Steam Sauna Combo
Overview
The Trinity Combination Sauna is the only sauna available that combines Finnmark’s UL listed Spectrum Plus infrared heaters combined with a traditional 120V sauna heater, plus true medical grade Spectrum Red Light™ Therapy.
No need to compromise. Finnmark’s FD-4 Trinity is the only combination sauna with true UL listed infrared heaters together with a traditional sauna heater.
Key Features
- Spectrum Plus™ UL Listed short wave infrared heaters for deep penetrating heat, up to 25x more than standard carbon panel heaters.
- Spectrum Red Light™ Therapy. 192 Diode medical grade LED panel capable of producing highly beneficial 650nm of red light therapy combined with chromotherapy for those days you need a little love.
- Antimicrobial Western Canadian cedar interior that protects against mold, bacteria and fungus.
- Thermal Plus™ Aspen exterior that will never rot, warp, decay or chip. Making FinnMark Design's full spectrum infrared saunas one of the healthiest and longest lasting saunas on the market.
- 3-IN-ONE Combination. Compromise no more. Introducing the only combination sauna with true UL listed infrared heaters combined with a traditional heater that produces high heat steam. Get all the benefits of infrared combined with traditional rocks with steam all while soaking in the benefits of a medical grade Red light therapy LED panel.
- Built-in LCD Wi-Fi touchscreen controller with bluetooth audio.
- Audio with 6" Hi-Fi speakers, 8mm tempered glass for the ultimate thermal retention.
- Extra large two-tier bench system.
- Low EMF sauna tested by a NASA award winning testing facility.
- High Emissivity infrared heaters.
- Wall-mounted design
- Stainless Steel construction
- 1.9kW
- For sauna rooms from 70 to 106 cu. ft.
- Requires a minimum of 29 lbs of sauna stones (1 Box-AC3000) Please note that each natural stone is unique in shape and size. We recommend purchasing an additional box of sauna stones to allow you to choose the highest quality of stone for fit, form, and function (Additional freight charges will apply).
- Built-in controls
- Ergonomic operating switches
- Switches can be installed on the right or left side of the heater
- Designed, engineered, and made in Finland
- Dimensions: 11"W (279mm) x 11"D (279mm) x 21" (533mm)
- 2-Year Warranty (Consumer use) Manufacturer's Note: Sauna heater stones are significant to the unit's safety. In order for the warranty to remain valid, the user is responsible for proper maintenance.
Weatherproof Cover made for this model · confirmed fit
Bench Cushion sized for this model · confirmed fit

The Trinity Series
Two complete saunas in one cabin.
Trinity pairs full-spectrum infrared panels with a genuine traditional rock heater, so you can choose dry radiant heat or humid löyly steam whenever the mood strikes. UL-listed Spectrum Plus™ infrared, an antimicrobial cedar interior and a Thermal Plus™ Aspen exterior deliver the best of both rituals without compromise.

INFRARED + TRADITIONAL
Two saunas in one
The Trinity FD-4 combines Spectrum Plus™ infrared, a 120V traditional heater and medical-grade Spectrum Red Light™ Therapy — infrared warmth or classic steam, your choice.

A LOOK INSIDE
Infrared, steam and red light
Inside the Trinity — dual heat sources and red-light therapy, shown true to scale.
Every Detail
Specifications & Details
Full Specifications
Model: FD-4
External Materials: Thermo-Aspen
Interior Materials: Western Red Cedar
Volts: 120
IR Watts: 1750
Amperage: 15/20
Plug Type: NEMA 5-15P
Outlet: Standard 120v 15a
Maximum Temperature: IR 170F - Traditional 190F
Interior Dimensions: 44.25"W x 45.5"D x 75.5"H
Exterior Dimensions: 48"W x 48"D x 83"H
Room Volume: 86 cu. ft.
Door Dimensions: 23.625"W x 68.875"H
Door Handle Dimensions: 1.5"W x 13.25"H
Glass Thickness: 8mm W/Gasket
Product Weight: 437 lbs
Shipping Dimensions: 80"W x 40"D x 58"H
Shipping Weight: 618 lbs
Model: Vega Compact 1900
Kilowatt Rating (KW): 1.9kW
Primary Fuel: Electric
Minimum Adjusted Cubic Feet: 70
Maximum Adjusted Cubic Feet: 106
Voltage: 120V
Phase: 1PH
Nominal Amps: 15.9 Amps
Heater Weight: 15.4 lbs
Shipping Weight with Sauna Stones: 59.4 lbs
Width In Inches: 11" (279mm)
Depth In Inches: 11" (279mm)
Height In Inches: 21" (533mm)
Specifications subject to change. Please contact us to verify current specifications before purchase.
What's Included
- Bottom Panel
- Top Panel
- Back Panel
- Front Panel
- Left Panel
- Right Panel
- Glass Door
- Bench Support
- Bench Top
- Heater Cable
- Floor Cable
- Screws
- Power Supply Unit
- Power Cable
- Interior Heater Connections with Wood Cover
- Door Handle (2 Screws)
- Infrared Sauna Heater Panels
- Harvia Vega Compact 1900 Sauna Heater
- 1 Box of the Harvia AC3000 0-10cm Sauna Stones (29 lbs) Please note that each natural stone is unique in shape and size. We recommend purchasing an additional box of sauna stones to allow you to choose the highest quality of stone for fit, form, and function (Additional freight charges will apply).
- Spectrum LED Near Infrared Ceiling Lights Combined with Medical-Grade Spectrum Red Light Therapy
- Controller 2.0, Built-In LCD Wi-Fi Touchscreen Control Panel with Bluetooth Audio
- ETL Certification
- Limited Warranty
Health Benefits
- The technology of the Spectrum Plus incoloy heaters warms your core body temperature, producing a cleaner, healthier sweat while lowering blood pressure, and maintaining heart health.
- The natural heat produced by the Spectrum Plus heaters is designed to achieve a more controlled hot climate much like a traditional sauna without the unbearable heat temperatures. This deeper penetration through sweating goes beyond the muscle and fat rather than a traditional or hot air sauna. As a result, you're able to work up the best possible sweat in the least amount of time.
- Spectrum Plus heaters remove 17% more toxins such as cholesterol, fat-soluble toxins, toxic heavy metals, sulfuric acid, sodium, ammonia and uric acid.
- Full Spectrum Sauna combination of long-wave Spectrum Carbon 360 infrared panels with UL-listed short-wave Spectrum Plus™ infrared panels. This combination provides higher temperatures, full body coverage, deeper penetration, and better experience than any other sauna.
- Reap the benefits of a more natural pain relief remedy with every infrared sauna session.
- Athletes can appreciate a faster muscle recovery with increased blood flow to the muscles, delivering more concentrated oxygen and creating more energy to heal.
Shipping & Warranty
Shipping: Ships free via freight carrier (curbside lift-gate) to the contiguous United States.
Warranty: Covered by Finnmark Design's manufacturer warranty on parts and workmanship. Contact Sauna Co. for complete shipping and warranty terms before purchase.
Resources
Documents & Manuals
Trinity Installation & User Manual
Warranty
to a friend
Two heating modes means a bit more to understand, but the manual and Sauna Co.'s guidance made it painless. Excellent heat both ways. Shipped on schedule.
Some days infrared, some days steam — the flexibility has spoiled us. The build quality is superb. Delivery was prompt and the cabin assembled cleanly.
The FD-4 Trinity lets me choose gentle infrared on recovery days and full traditional steam when I want a hard sweat. Having both in one beautiful cabin is brilliant. Sauna Co. explained the dual systems clearly and shipped it well-protected.
