Finnmark FD-4 Trinity Infra-Steam Sauna

The Finnmark FD-4 Trinity Infra-Steam Sauna is a 2-person infrared and traditional sauna measuring 48" (121.9 cm) wide × 48" (121.9 cm) deep × 83" (210.8 cm) high, running on a 120V 15.9A supply. It reaches 170° F on infrared and 190° F on the traditional heater.

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. Get all the benefits of infrared combined with traditional rocks with steam. Get hot fast! The only IR heaters that have passed the rigorous tests from Underwriter Laboratories used in tandem with a traditional steam sauna stove. Short wave far-infrared penetrates muscles, joints, and makes you sweat 25 times more than carbon panel heaters.

• 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.

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).

These are not included. You need them before the sauna will run.

Finnmark states the cabin is ETL certified and that the short-wave Spectrum Plus infrared panels are UL listed. Ask us for the certificates if your inspector or insurer wants to see them.

The FD-4 Trinity Infra-Steam Sauna seats 2. Interior 45.2" (114.9 cm) × 44.5" (113 cm) × 75.5" (191.7 cm); exterior 48" (121.9 cm) × 48" (121.9 cm) × 83" (210.8 cm).

Measure the exterior against your space, and the door against the route you will carry the panels through. The cabin arrives flat as panels, so the constraint is usually the doorway rather than the room.

What Finnmark publishes about infrared heat. These are the manufacturer's claims, not medical advice.

• 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.
• 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.

Finnmark makes these to fit the FD-4. All sold separately.

The traditional side of this cabin is a Harvia heater on Harvia stones. Those are the same parts we stock, so replacements and extra stones are easy to source.

• The cabin arrives flat as numbered panels and assembles with the supplied screws. Two people and a couple of hours is the usual job.
• Site it on a level floor. The supplied adjustable feet take up small variations, but the panels need a flat base to seat squarely.
• Infrared cabins are for indoor use on a finished floor. Leave clearance at the back for the power connections and airflow.
• The traditional heater takes sauna stones and water; the infrared panels do not. Never pour water onto an infrared panel.

What electrical supply does the FD-4 need?

A dedicated 120V circuit rated at least 15.9 A for the infrared side. The traditional heater is a separate 1900 W load and the file publishes no amperage for it, so have your electrician size the combined draw from the nameplate.

What does Infra-Steam mean on the FD-4?

It has both heat sources: 1750 W of infrared panels reaching 170° F, and a 1900 W traditional heater reaching 190° F, so you can take a dry infrared session or a conventional steam sauna in the same cabin.

Will the FD-4 fit through my doorway?

It ships flat as panels rather than assembled, so the doorway is rarely the problem — the largest single panel is what matters, not the 48" (121.9 cm) × 48" (121.9 cm) assembled footprint. Measure your space against the exterior dimensions above.

FD-KN004 Spec Sheet

FinnMark-Trinity-IOM-2023.pdf

Finnmark-Designs-V2-WIFI-Controller-Manual-Updated-2024-V2.9 (2).pdf

PR108242_EMF-Test-Log-Finnmark-Designs.pdf

Finnmark-Infrared-Sauna-Warranty.pdf