Expert help that stays with you

Small details become expensive problems once installation begins. We ask the questions early, so a mismatched part, an overlooked requirement or an installation issue gets caught while it is still easy to fix.

Our job does not end when your order ships. We stay available through installation and beyond. If something needs attention, we stay involved, work the problem, and help see it through.

We want you to feel good about choosing Sauna Marketplace long after your first session, and confident recommending us to a friend. That standard guides the advice we give, the products we sell, and the way we take care of our customers.

Sauna and heater customers also receive free shipping on sauna accessories for life.

Planning a sauna, or need help with one you purchased from us? Our founders have built saunas from the crate up and both run saunas at home. New customers and existing Sauna Marketplace sauna and heater owners can Book a Ben consultation.

Specs
Exterior Shortest Side (in)48.8
Exterior Longest Side (in)Maximum Exterior Length of the longest side when assembled.48.8
Exterior Height (in)Maximum exterior height from earth to roof peak83.1
ModelTrinity FD4
Bench Length (in)Maximum bench length in inches.44
People2
DIY FriendlyDIY Friendly Saunas means a professional is not required for the build. Basic tools like a drill, hammer, and level are typically required. With Sauna Marketplace, you do not risk your warranty by assembling a sauna yourself. If you prefer a professional installation, please reach out to the Sauna Marketplace team so we can check for a trusted installer near you.Yes*An electrician is still required for all electrical work!
Exterior MaterialsThermo-Aspen
InsulationYes – European StandardEuropean Sauna Construction Standards consist of a thick, insulated wall assembly that maximizes the drying potential of interior and exterior cladding. The typical wall assembly consists of Exterior Cladding -> Air Gap -> Rain Barrier -> Studded Wall with Mineral Wool Insulation -> Foil Radiant Barrier with Taped Seams -> Air Gap -> Interior Cladding.
Room Height at Heater (in)Interior Height at heater position in inches. In context of a heater, this is the minimum height required to instal. In context of a sauna, this allows you to find a heater that can be safely installed.75
Interior MaterialsWestern Red Cedar
Made in
Shipping CostPlease inquire if shipping outside the continental USA.Free
Shipping MethodLTL Curbside Delivery w/ Lift Gate ServiceOur shipping partners will deliver your sauna curbside. They are not responsible for moving it into the garage or final location, so please plan to offload the crate yourself. Larger crates may require a forklift or loading dock. Please contact Sauna Marketplace to plan for a smooth delivery and installation.
Warranty5 years: cabin, controls and wiring, factory heater components, audio; 1 year: cover fabric
Adjusted Volume131
Glass LocationGlass door
Door WallSquare footprint
Layout HandingOne layout
Attachments
Gallery
Finnmark Fd4 Trinity Infrared And Traditional Sauna With Red Light Therapy
Finnmark Designs Fd4 Trinity Hybrid Infrared And Traditional Sauna - Image 2
Finnmark Designs Fd4 Trinity Hybrid Infrared And Traditional Sauna - Image 3
Finnmark Designs Fd4 Trinity Hybrid Infrared And Traditional Sauna - Image 4
Finnmark Designs Fd4 Trinity Hybrid Infrared And Traditional Sauna - Image 5
Finnmark Designs Fd4 Trinity Hybrid Infrared And Traditional Sauna - Image 6
Finnmark Designs Fd4 Trinity Hybrid Infrared And Traditional Sauna - Image 7
Finnmark Designs Fd4 Trinity Hybrid Infrared And Traditional Sauna - Image 8
Finnmark Designs Fd4 Trinity Hybrid Infrared And Traditional Sauna - Image 9
Finnmark Designs Fd4 Trinity Hybrid Infrared And Traditional Sauna - Image 10
Finnmark Designs Fd4 Trinity Hybrid Infrared And Traditional Sauna - Image 11
Finnmark Designs Fd4 Trinity Hybrid Infrared And Traditional Sauna - Image 12
Finnmark Designs Fd4 Trinity Hybrid Infrared And Traditional Sauna - Image 13
Finnmark Designs Fd4 Trinity Hybrid Infrared And Traditional Sauna - Image 14
    Includes

    Comes with everything you need! 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 0-3.9 in 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), medical-grade LED red light therapy with 650nm plus color chromotherapy, V2 LCD controller 5" touchscreen with Bluetooth, ETL certification, US-Based Support, full manufacturer warranty.

    Ship Free!

    Yes, all Finnmark rooms ship for free within the continental US.  Contact Sauna Marketplace for a worldwide shipping.

    Finnmark Designs FD4 Trinity Hybrid Infrared AND Traditional Sauna

    FD-1 FD-2 FD-3 FD-6 FD-7 FD5 Trinity XL Trinity FD4

    Can’t decide between short-wave infrared, long-wave infrared, red light therapy, or a traditional sauna?

    The Finnmark FD-4 Trinity has all of them. Finnmark says its panels are designed to handle the heat and humidity of the included Finnish sauna heater with rocks.

    Walls are insulated up to 4” thick with mineral wool and a radiant barrier. Western red cedar on the inside, Thermo-Aspen on the outside. Built to European sauna standards. Finnmark rates the infrared system alone to 170°F.

    5-year warranty. All parts stocked in North America. This is the everything sauna.

    Build Your Quote:

    FD-1 FD-2 FD-3 FD-6 FD-7 FD5 Trinity XL Trinity FD4

    $7,795.00

    Explore this sauna in 3D

    Cover

    Add a marine grade cover to make your FD4 an outdoor sauna! This cover is also great for transporting, or for keeping it looking new in a basement or garage.

    None Marine Grade Cover +$1,298.00

    Share your selected options and add-ons. Prices and availability are confirmed when the link is opened.

    Pay over time:
    Pay with HSA/FSA:
    Finnmark

    Questions

    Do you offer installation?

    We don’t install saunas ourselves, but we have installers and electricians we’ve worked with before, and we can recommend them in most areas. Send us your ZIP code and we’ll check who’s near you. You hire them directly.

    Explore the real 360° tour in the gallery above

    Why we carry this infrared sauna

    It's fair to call us 'Infrared Skeptics' here at Sauna Marketplace.  In fact, we don't even like to call them saunas.  To us, a sauna requires heated rocks and steam.  But we've been hearing from professional athletes, trainers, and doctors that there are real benefits, and infrared technology is a useful tool for health, recovery, and wellness.

    We took a deep dive and were happy to find Finnmark Designs doing everything right.  From materials to technology - Finnmark REALLY stood out.  But the experience is what won us over.

    Because the rooms are so well constructed and insulated, they can actually reach 170°F with with infrared technology alone.  Better yet, Finnmark designed their panels to withstand the higher temperatures and humidity of a traditional Finnish sauna.  That means they can be paired with traditional Finnish sauna heaters with rocks and steam.  

    And the FD4 Trinity Sauna is born.  And yes, since it has a traditional heater we can all agree this is a Sauna :)

    The Infrared That Lasts

    And you won't get left behind, not with Finnmark on Sauna Marketplace.

    We hear from infrared customers all the time who are unable to find parts to repair their heaters.  Finnmark stocks all parts in North America.

    We still think a traditional Finnish sauna (with rocks and steam) are the best, but there are good reasons to go with Infrared, and Finnmark is the infrared maker we chose to carry, including for hybrid rooms like this one.

    No reviews of this product yet

    Bought this one? Yours would be the first. Every rating goes through the same check before it appears.

    Reviews of Sauna Marketplace

    What customers say about working with our team. Names are shortened to a first name and last initial, or to initials.

    ★★★★★

    “Thank you for all your help, it was really a good experience!”

    C. C.
    ★★★★★

    “The service was incredible!”

    John B.
    ★★★★★

    “The process to purchase was easy and the shipment made it quickly and any questions I had about where items were was quick addresses. Overall great service.”

    Johnathan G.
    Expert help that stays with you

    Small details become expensive problems once installation begins. We ask the questions early, so a mismatched part, an overlooked requirement or an installation issue gets caught while it is still easy to fix.

    Our job does not end when your order ships. We stay available through installation and beyond. If something needs attention, we stay involved, work the problem, and help see it through.

    We want you to feel good about choosing Sauna Marketplace long after your first session, and confident recommending us to a friend. That standard guides the advice we give, the products we sell, and the way we take care of our customers.

    Sauna and heater customers also receive free shipping on sauna accessories for life.

    Planning a sauna, or need help with one you purchased from us? Our founders have built saunas from the crate up and both run saunas at home. New customers and existing Sauna Marketplace sauna and heater owners can Book a Ben consultation.

    Specs
    Exterior Shortest Side (in)48.8
    Exterior Longest Side (in)Maximum Exterior Length of the longest side when assembled.48.8
    Exterior Height (in)Maximum exterior height from earth to roof peak83.1
    ModelTrinity FD4
    Bench Length (in)Maximum bench length in inches.44
    People2
    DIY FriendlyDIY Friendly Saunas means a professional is not required for the build. Basic tools like a drill, hammer, and level are typically required. With Sauna Marketplace, you do not risk your warranty by assembling a sauna yourself. If you prefer a professional installation, please reach out to the Sauna Marketplace team so we can check for a trusted installer near you.Yes*An electrician is still required for all electrical work!
    Exterior MaterialsThermo-Aspen
    InsulationYes – European StandardEuropean Sauna Construction Standards consist of a thick, insulated wall assembly that maximizes the drying potential of interior and exterior cladding. The typical wall assembly consists of Exterior Cladding -> Air Gap -> Rain Barrier -> Studded Wall with Mineral Wool Insulation -> Foil Radiant Barrier with Taped Seams -> Air Gap -> Interior Cladding.
    Room Height at Heater (in)Interior Height at heater position in inches. In context of a heater, this is the minimum height required to instal. In context of a sauna, this allows you to find a heater that can be safely installed.75
    Interior MaterialsWestern Red Cedar
    Made in
    Shipping CostPlease inquire if shipping outside the continental USA.Free
    Shipping MethodLTL Curbside Delivery w/ Lift Gate ServiceOur shipping partners will deliver your sauna curbside. They are not responsible for moving it into the garage or final location, so please plan to offload the crate yourself. Larger crates may require a forklift or loading dock. Please contact Sauna Marketplace to plan for a smooth delivery and installation.
    Warranty5 years: cabin, controls and wiring, factory heater components, audio; 1 year: cover fabric
    Adjusted Volume131
    Glass LocationGlass door
    Door WallSquare footprint
    Layout HandingOne layout
    Attachments
    Gallery
    Finnmark Fd4 Trinity Infrared And Traditional Sauna With Red Light Therapy
    Finnmark Designs Fd4 Trinity Hybrid Infrared And Traditional Sauna - Image 2
    Finnmark Designs Fd4 Trinity Hybrid Infrared And Traditional Sauna - Image 3
    Finnmark Designs Fd4 Trinity Hybrid Infrared And Traditional Sauna - Image 4
    Finnmark Designs Fd4 Trinity Hybrid Infrared And Traditional Sauna - Image 5
    Finnmark Designs Fd4 Trinity Hybrid Infrared And Traditional Sauna - Image 6
    Finnmark Designs Fd4 Trinity Hybrid Infrared And Traditional Sauna - Image 7
    Finnmark Designs Fd4 Trinity Hybrid Infrared And Traditional Sauna - Image 8
    Finnmark Designs Fd4 Trinity Hybrid Infrared And Traditional Sauna - Image 9
    Finnmark Designs Fd4 Trinity Hybrid Infrared And Traditional Sauna - Image 10
    Finnmark Designs Fd4 Trinity Hybrid Infrared And Traditional Sauna - Image 11
    Finnmark Designs Fd4 Trinity Hybrid Infrared And Traditional Sauna - Image 12
    Finnmark Designs Fd4 Trinity Hybrid Infrared And Traditional Sauna - Image 13
    Finnmark Designs Fd4 Trinity Hybrid Infrared And Traditional Sauna - Image 14
      Includes

      Comes with everything you need! 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 0-3.9 in 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), medical-grade LED red light therapy with 650nm plus color chromotherapy, V2 LCD controller 5" touchscreen with Bluetooth, ETL certification, US-Based Support, full manufacturer warranty.

      Ship Free!

      Yes, all Finnmark rooms ship for free within the continental US.  Contact Sauna Marketplace for a worldwide shipping.