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info@squaresauna.com
Toll-free: (212) 555-7394
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. Furthermore, the IR panels, red light therapy, and the traditional sauna heater are all powered by a standard 120V and can be plugged into a common outlet, so no electrician is needed. 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.
The traditional 1.9kW sauna heater lets you splash some water onto the rocks for a luxurious steam sauna experience. Reap the benefits and the intensity only offered by a steam sauna.
Red light therapy is a type of phototherapy that uses low-level light wavelengths to penetrate the skin and stimulate the production of collagen and other proteins, which can lead to numerous potential health benefits. It’s a perfect enhancement to your sauna wellness ritual.
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). Medical Grade LED Red light therapy with 650nm plus color chromotherapy V2 LCD Controller 5" Touchscreen with Bluetooth ETL Certification Limited Warranty
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 touchscreen controller with Bluetooth audio.
Audio with 6" HiFi marine grade 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
Harvia Vega Compact 1900
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.
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 a 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.
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"W x 45'D x 75"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 36"W x 80"D Shipping Weight 485 lbs W/48 lb Pallet
Installation and Operation Manual Finnmark FD-4 Diagram EMF Test Log UL Listing Finnmark Certification Harvia Vega Heater Installation and Operation Manual Harvia Sauna Stones
Finnmark Designs warrants to the original purchaser (“you”) the following regarding your new sauna, when (a) is installed in accordance with installation instructions provided, (b) is properly and reasonably maintained, and (c) has not been subjected to damage, misuse, or abuse, and (d) is for residential use only For more, please refer to the Finnmark Warranty
Contact us through chat, email or phone to get detailed shipping times. If your ordered product is in stock we will ship the product 1-5 days from your order.
The weight or packaging of this product requires delivery by special appointment, and on a wooden pallet.
The driver is responsible for curbside delivery “only” and will lower the items to ground level.
Prior to shipping this product, we contact you to share shipment details and discuss any extenuating delivery circumstances that may complicate or cause additional delivery expenses.
Cancellations & Refunds
Nordica Sauna prides itself on having one of the best return policies in the industry. Cancel any time before your order has shipped, completely free of charge (exceptions apply, including custom made orders).
Call 1-877-587-5387 or email customercare@nordicasauna.com
When will I know my order has shipped?
As soon as you place your order, you will receive an order confirmation e-mail. This means that we have received your order in our system and pre-authorized your credit card for the purchase. As soon as we receive your order, we automatically reach out to our suppliers to confirm that it is in stock and available for immediate shipment. If your item is on backorder or unavailable, we will void the pre-authorization and reach out to you via e-mail. If your item(s) are available for immediate shipment (within 5 business days), we will process the charges and submit the order for shipment.
When will my order ship?
If your order is in stock and we process the charges to your credit card, it will ship within five business days from the date of your order. We will send you tracking information within 24 hours of your order leaving the warehouse to the e-mail address you provided when checking out. If you do not receive tracking information from us within six business days of your order, feel free to follow up with us at customercare@nordicasauna.com.
No shipping outside the lower 48 States in the USA.
What if my shipment is damaged?
Please inspect the packaging of your item(s) when they arrive. If you notice any damage, you should make note of it when signing for delivery. If your item(s) do arrive damaged please send photos to customercare@nordicasauna.com and we will process an insurance claim on your behalf.
Cancellations (Before order ships)
Nordica Sauna prides itself on having one of the best return policies in the industry. Cancel any time before your order has shipped, completely free of charge (exceptions apply, including custom made orders). Reach agents during business hours at 1-877-587-5387, the chat on our website, or email customercare@nordicasauna.com
Cancellations of customer orders
Custom or made to order products cannot be canceled or refunded as these products are put into production specifically for your order. These units are custom made to your specification or created once you order. Once you place your order they start building your unit. Your warranty will guarantee you a fully functional and operational product. If it is not clear whether your order is custom or made to order, please message or call us.
All sales are final for Custom made and Made-to-order products.
Refunds & Returns
If you need to exchange your product, you may do so. You, as the customer, are responsible for any shipping costs throughout any returns or exchange processes.
Not all orders are available for return once they have shipped. We order products directly from the manufacturer. Therefore, if the manufacturer will not permit us to return a product, we cannot offer you a return. This often varies on a case-by-case basis; please reach out to us if you would like specific information on your brand and/or product.
Due to drastically increasing LTL/freight shipping costs, any outright returns will incur a 25% cancellation fee + return shipping costs. If you are replacing the product with something else, we may be able to help you cover some of the costs depending on the product.
Seller reserves the right to refuse to refund any deposit or payment, or cancel any payment due, and any owing until such time as Seller a) is in receipt of the goods b) has inspected the goods and c) in the Sellers discretion, has found the goods to be free of damage. All refunds will be provided within 5 business days once the product has been returned to the warehouse and inspected for damage.
We promise to do our best to get your order to you as soon as possible. We provide estimated shipping times on the product pages based upon what our suppliers and freight companies tell us, and those estimated shipping times may change or vary without notice (Due to supply chain issues, the steel mills behind on making metal, the manufacturers delayed because of the mills, the overwhelmingly demand on shipping, factory/warehouse and dock workers and so on).
The FD-4 Trinity is designed for up to 4 adults, offering a spacious yet cozy wellness experience.
This sauna combines full-spectrum infrared heaters with a traditional steam option, giving you the flexibility to enjoy dry heat, soothing steam, or both—depending on your preference.
The sauna is crafted from high-quality Canadian Hemlock wood with tempered glass, ensuring durability, a modern look, and excellent heat retention.
The FD-4 Trinity is primarily designed for indoor use. If placed outdoors, it must be set up in a covered, weather-protected area.
Installation is straightforward with pre-fabricated panels and clear instructions. Two adults can typically assemble it within a few hours—no special tools required.
The FD-4 requires a dedicated electrical connection (220–240V). We recommend professional installation by a licensed electrician for safety.
It comes with UL and CE-certified components, low EMF heaters, a built-in timer, and automatic shut-off for worry-free operation.
Yes—your sauna is backed by a manufacturer’s warranty covering structural components and electrical parts for peace of mind.
The package includes an ergonomic bench, infrared panels, steam generator, control panel, chromotherapy lighting, and Bluetooth speakers.
The infrared heaters begin warming instantly, while full heating typically takes 15–20 minutes. Steam generation time may vary.
Yes—we provide free curbside delivery within the continental U.S. Returns are accepted on unopened, unused saunas within the return window. Please see our full Shipping & Returns Policy for details.
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