Finnmark Designs FD-3 Full Spectrum Infrared Sauna

$6,495.00

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Recommended Add-Ons

Finnmark FD-3 Cover
Finnmark FD3 Waterproof Sauna Cover, 72"x46"x78", Avena (+$1,198.00)
Finnmark FD-3 Cushion
Finnmark FD-3 Sauna Cushion, 3-4 Person, Marine Grade Vinyl (+$293.00)
Finnmark Backrest
Canadian Red Cedar Ergonomic S-Shape Sauna Backrest (+$89)
Finnmark Head Rest
Wooden Sauna Headrest w/Cloth Neck Support (+$39)

Wood Treatment

SaunaLife Sauna Wood Wax
Sauna Wood Wax, 15.2 oz.+$23.90
SaunaLife Paraffin Oil
Sauna Paraffin Oil Odorless Sauna Wood Oil 500ml (16.9 oz)+$25.9
SaunaLife Wood Cleaner
SaunaLife Sauna Cleaner 1 Gallon+$29.00
Product price: $6,495.00
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Finnmark Designs FD-3 Full Spectrum Infrared Sauna At Home

Finnmark Designs FD-3: a four person indoor infrared sauna with a wide bench

The Finnmark Designs FD-3 is a four person indoor infrared sauna. Full spectrum means it mixes two kinds of infrared heaters, carbon panels for gentle all over warmth and Spectrum Plus heaters for stronger direct heat. Red light lamps in the ceiling add a warm glow. The outside is thermo-aspen, which is aspen baked in a kiln so it will not warp or rot. The inside is Western Canadian cedar, a smooth wood that resists mold. Four people can sit on the wide bench across the back. A full glass door lets in light. It takes up about 71 by 45 inches of floor space, so plan for a spot in a basement, a home gym, or a large spare room.

It needs a 240 volt outlet on its own circuit, wired by a licensed electrician. The room warms to 170 degrees in about an hour. Inside you get a touchscreen control panel with Bluetooth and speakers, and adjustable feet for an uneven floor. It comes as a kit of finished panels that screw together. On the page you can add a waterproof cover, a four person vinyl seat cushion, a cedar backrest, a headrest, and wood wax or oil. Want a traditional stove and steam in the same room? See the Finnmark Designs FD-5 hybrid sauna. The Finnmark Designs FD-3 ships free from My Cozy Outdoors with No Sales Tax (except WY) and the full manufacturer warranty.

Health Benefits

Benefits of Infrared 

  • 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.

Includes

The following items are 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)
  • Removable and adjustable sauna feet for uneven surfaces
  • Infrared Sauna Heater Panels
  • Spectrum LED near infrared ceiling lights combined with medical grade Spectrum Red Light therapy
  • Controller 2.0, built-in LCD touchscreen control panel with Bluetooth audio
  • Audio upgrade with 6″ HiFi speakers, 8mm tempered glass for the ultimate thermal retention
  • ETL Certification
  • Limited Warranty

Specifications

Model FD-3
External Materials Thermo-Aspen (Thermal Plus™ kiln-treated aspen)
Interior Materials Clear “A” grade Western Canadian Red Cedar
Seats 3-4
Volts 240
Watts 3150
Amperage 15
Phase Single
Plug Type NEMA 6-15P
Outlet 240v 15a outlet
Maximum Temperature 170F
Infrared Heaters (4) Spectrum Plus™ dual wave (far and mid) on back wall, (1) under bench and (2) on front wall; (2) Spectrum™ Carbon far infrared on each sidewall
Interior Dimensions 67.2″W x 41.6″D x 70.5″H
Exterior Dimensions 70.9″W x 45.3″D x 78.3″H
Bench Dimensions 67.2″W x 21.3″D
Room Volume 114.1 cu. ft.
Door Dimensions 23.63″W x 67.88″H
Door Handle Dimensions 1.875″W x 11.625″H
Glass Thickness 8mm
Product Weight 488 lbs
Shipping Dimensions 36″W x 78″D
Shipping Weight 536 lbs w/48 lb Pallet

Manual

Finnmark FD-3 Installation and Operation Manual (Aug 2026)

Finnmark V2 WiFi Controller Manual

Finnmark Designs Sauna Warranty

FAQ

Does the FD-3 plug into a regular outlet?

No. This four-person cabin runs on 240 V, 15 A, single phase with a NEMA 6-15P plug, so you need a 240 V receptacle on its own circuit; the product page and the linked manual both say to have an electrician install it. The manual also asks for a properly grounded outlet, no extension cords, and a GFCI in any potentially damp location.

How much room do I need for a four-person infrared sauna?

The cabin is 72 in wide, 46 in deep and 78 in tall on the outside, with a 67 x 41 x 70 in interior of about 111 cubic feet. Add the 3 inches of clearance the manual requires on the top and all sides, so about 78 x 52 in of floor under an 81 in ceiling. The glass door is 23.6 in wide. It is freestanding and should not be built into a structure.

How long does it take to heat up, and how hot does it get?

Maximum temperature is 170 F. The manual’s warm-up table lists 55 to 65 minutes for the 3-4 person model to reach that ceiling, and suggests waiting 15 to 20 minutes for a comfortable temperature before a session. Warm-up depends on the ambient temperature, airflow and placement, and the manual recommends two or three full-heat cycles on first use to burn off factory dust.

How heavy is it, and how does it arrive?

The assembled sauna weighs 488 lb; it ships at 536 lb on a 48 lb wooden pallet measuring about 36 x 78 in. Delivery is curbside by appointment, so plan on help to move the panels inside. Assembly follows the linked manual: bottom panel and feet, back and side panels, bench, front panel with glass door, then the top panel, which the manual says takes two people.

What accessories are included, and which are optional?

The Includes tab covers the complete panel kit, glass door, bench, infrared heater panels, Spectrum LED ceiling lights with red-light therapy, the LCD touchscreen controller with Bluetooth, 6 in HiFi speakers, power supply and hardware. The FD-3 waterproof cover, a 3-4 person marine vinyl cushion, cedar backrest, headrest and wood-care items are optional; they appear in the selectors on this page with their prices. See more infrared saunas here.

How often can I use it, and how long should a session be?

The manual suggests no more than three sessions a week for the first four weeks and daily use after six weeks if you wish. Sessions of at least 30 minutes give noticeable results, with 45 minutes advised for therapeutic use; start at a lower temperature and work up. Drink water before, during and after, and consult your physician first if you have a medical condition or are pregnant.

What does the warranty cover?

The Limited Warranty in the manual linked under the Manual tab covers the original residential purchaser: Spectrum Plus heaters for life; carbon heaters, craftsmanship, electrical components and audio components for 10 years; the lighting remote for 1 year; and commercial use for 5 years. It excludes broken glass, bulbs, weather damage and units placed outdoors without the cover, and freight for parts after 30 days is the customer’s.

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