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We stand behind the quality and craftsmanship of this sauna. That’s why it comes with a 10-year warranty.
Setting up your sauna is a breeze with our intuitive, snap-together design. No tools or prior experience needed.
The Trinity Hybrid 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. 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.
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 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 (Included)
- Wall-mounted design
- Stainless Steel construction
- 1.9kW direct (hardwired) connection. Consult a certified electrician
- For sauna rooms from 70 to 106 cu. ft.
- Sauna stones included
- Built-in controls
- Designed, engineered, and made in Finland
- Dimensions: 11"W (279mm) x 11"D (279mm) x 21" (533mm)
- 2-Year Warranty (Consumer use)
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 | 170F |
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 |
Product Manual
Fast & Free Shipping Nationwide
We offer free shipping on all orders within the continental U.S. through our network of warehouses in California, Illinois, Virginia, and beyond. Once you place your order, you’ll receive a confirmation email, and we’ll begin processing it right away.
For in-stock items, expect them to ship within 2-4 business days, and delivery typically takes an additional 3-7 business days. Smaller items ship quickly via standard carriers like UPS, FedEx, or USPS, while larger saunas are delivered via freight carriers with curbside service.
You’ll receive a tracking number once your order ships, and for larger deliveries, the carrier will contact you to schedule a convenient 4-hour delivery window. Upon arrival, please inspect your order before signing to ensure everything is in perfect condition.
We’re committed to making the shipping process smooth and worry-free so you can enjoy your new sauna without delay!
Effortless Assembly—No Expertise Needed!
This sauna features a smart, modular design with a clasp-together assembly and tongue-and-groove panels, making setup a breeze. With no tools or expertise required, two adults can have it fully assembled in just 30 minutes to 2 hours. Every piece fits seamlessly, ensuring a sturdy build that’s ready for use right away. Whether you’re a DIY pro or a first-timer, you’ll enjoy a hassle-free, snap-together experience and be relaxing in your new sauna in no time!
Note: If you prefer not to assemble it yourself, we recommend hiring a local handyman. Thanks to the simplicity of our sauna kits, any handyman team can easily complete the setup with no prior experience required.
Comprehensive Warranty for Peace of Mind
We stand behind the quality of every sauna we sell, offering a full manufacturer’s warranty to ensure lasting performance. If anything goes wrong during the warranty period, we’ll replace the defective part at no cost to you, including shipping. Labor costs aren’t covered, but no worries—our saunas are designed with easy-to-remove parts that pop in and out, so professional help isn’t required.
Sauna Health Benefits
Saunas offer a wide range of scientifically supported health benefits. Unlike traditional saunas, infrared heat penetrates deeper into the body, heating you from the inside out and promoting enhanced detoxification, circulation, and relaxation.
- Detoxification: Saunas increase sweat production, helping eliminate toxins like heavy metals and chemicals. Studies show that infrared therapy can boost detoxification by up to 20% more than traditional saunas.
- Improved Cardiovascular Health: Regular sauna use has been shown to lower blood pressure, improve circulation, and reduce the risk of heart disease by 46%, according to a study published in JAMA.
- Pain Relief & Muscle Recovery: Heat helps reduce inflammation, alleviate pain, and accelerate muscle recovery. Clinical trials report that 70% of patients with chronic pain experienced relief with consistent heat therapy.
- Skin Health & Anti-Aging: Saunas stimulate collagen production, improving skin elasticity and reducing wrinkles. Research shows an increase in skin hydration and a 26% reduction in wrinkles after regular use.
- Stress Relief & Better Sleep: Saunas promote relaxation by reducing cortisol levels, leading to better stress management and improved sleep quality. 83% of users report feeling more relaxed and sleeping better after sessions.
These benefits make saunas a powerful tool for overall wellness, helping you feel healthier inside and out.

Sauna Success Toolkit
Enhance your sauna experience with this specially designed bonus feature to help you achieve your health and wellness goals and get the most out of your sauna investment.

We are US owned and operated with our main headquarters located in Chicago, Illinois. We ship orders anywhere within the continental US from our distributed network of warehouses operated by our logistics partners in California, Illinois, Texas, Toronto, New York, and Florida.
We're proud to provide FREE SHIPPING on all of our products throughout the Continental United States.
1-2 weeks if you order today. In stock products will ship out within 2-4 business days. Once your order leaves the warehouse, depending on where you're located, transit time will take between 3-7 business days.
As soon as you place your order, you will receive an email from us with your confirmation details. Please keep this email for your records. After we receive your order we will begin preparing your order for shipment. As soon as your order ships, you will receive an email with tracking information. 1-2 days prior to delivery, you will receive a phone call from the delivery team to schedule your delivery appointment. You must be home to accept and sign for the delivery during your appointment as scheduled.
The cord is approximately 9 feet long and it comes out of the top of the unit at the back in the center.
Chromotherapy, also known as color therapy, is a form of alternative therapy that uses colors to improve physical and mental well-being. The idea behind chromotherapy is that different colors have specific wavelengths and energy frequencies, which can influence a person’s mood, emotions, and even health when absorbed by the body. Each color is believed to have unique healing properties.
- Red: Stimulates energy, vitality, and circulation.
- Orange: Promotes creativity, enthusiasm, and emotional balance.
- Yellow: Boosts mood, self-confidence, and concentration.
- Green: Known for its calming and balancing effects, aiding in relaxation and stress relief.
- Blue: Soothes anxiety, promotes calm, and helps with sleep disorders.
- Indigo: Encourages deeper levels of relaxation and introspection.
- Violet: Supports mental clarity and spiritual awareness.
Red light therapy uses low wavelengths of red or near-infrared light to penetrate the skin and stimulate cellular repair, boost collagen production, and reduce inflammation. It’s commonly used for improving skin health (anti-aging, wrinkles), speeding up muscle recovery, relieving pain, and enhancing circulation. It’s also beneficial for wound healing, hair growth, and even improving sleep and mood by supporting cellular energy production and reducing stress on the body.
The built-in red light therapy is in the ceiling of the sauna. If you're serious about getting maximum benefit from red light therapy, the additional panel is much more high powered and targeted than the built-in red light.
If you prefer not to assemble it yourself, we recommend hiring a local handyman. Thanks to the simplicity of our sauna kits, any handyman team can easily complete the setup with no prior experience required.
We sure do! To access your financing offer, please select Shop Pay Installments as your payment method in Step 3 of the checkout process. Please note that you will need to input a debit card to receive your offer but you can still back out after that step.
Our traditional saunas typically get up to 195F with a basic heater and can get up to 230F with a premium heater. Most of our infrared saunas get up to 140F, but if you want an infrared sauna that gets up to 170F, check out our Finnmark Collection.
Yes, as long as it's not exposed to sun and rain directly. If you don't plan to put it under a covered patio or something similar, we recommend getting our custom outdoor sauna cover for it and keeping it covered as shown.
Yes, these are some of the most common locations customers decide to put our saunas. However, when it is cold outside, the sauna will take longer than normal to heat up to maximum temperature.
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