Indoor Infrared & Traditional Sauna
Finnmark FD-5 Trinity XL 4-Person Infrared & Steam Sauna
The Trinity XL is the biggest room Finnmark build for indoors: 130 cubic feet, an interior 71 inches wide by 57.5 deep by 75.5 high, and an exterior of 75 by 64 by 83 inches. Finnmark rate it for three to four bathers. Where the FD-4 gives you a two-seat hybrid, this one is sized for a group and heated accordingly.
A Harvia KIP45B comes with it — 4.5kW, 240V, single phase, 18.8 nominal amps, weighing 40 lbs, rated by Harvia for 100 to 210 adjusted cubic feet — along with a 44 lb box of Harvia AC3000 stones. Infrared runs on 240V as well, so the whole cabin is a 240V install and needs a licensed electrician. Traditional heat tops out at 190°F, infrared at 170°F.
Capacity4 Bathers130 cu ft interiorExterior75″ × 64″83″ tallInterior71″ × 57.5″75.5″ tallRock Heater4.5kWHarvia KIP45B, included130 cubic feet inside4.5kW Harvia KIP45B included44 lbs of AC3000 stones190°F traditional, 170°F infrared
The Build
What It Takes To Heat 130 Cubic Feet Two Ways
The Trinity XL asks a 4.5kW rock heater and infrared on four walls to cover the largest indoor volume Finnmark offer. It is the only indoor cabin running 240V on both the infrared side and the rock heater.
?Harvia KIP45B, 4.5kWAn electric rock heater at 4.5kW, 240V single phase, 18.8 nominal amps, 40 lbs, rated by Harvia for 100 to 210 adjusted cubic feet. The FD-5’s 130 cubic feet sits inside that band with headroom either side. A 44 lb box of Harvia AC3000 stones, 0 to 10cm, ships with it.Included · 44 lbs Of Stones?Infrared On Four WallsFour Spectrum Plus dual wave panels on the back wall, two under the bench, two on each side wall and one on the front wall. UL Listed incoloy short-wave elements producing mid and far infrared, rated .99 emissivity and 40,000 hours.Lifetime Heater Warranty?Spectrum Red Light™ TherapyA 192-diode medical grade LED panel at 650nm, with chromotherapy lighting fitted alongside it. The gallery shows the same cabin lit in red, blue, green and yellow.192 Diodes At 650nm⚡240V ThroughoutBoth sides of the FD-5 run on 240 volts. Finnmark’s requirement for the Harvia alone is a 240v 20a supply installed by an electrician. Get the circuits confirmed before the freight truck is booked.Licensed Electrician Required
Why Athletes Choose This
Eight Things The XL Adds
Health claims for infrared and red light are Finnmark’s own, published with their own FDA disclaimer, and they stay attributed to Finnmark. The eight below come from the FD-5’s specification, its included equipment and Finnmark’s stated warranty.
?130 cubic feet insideLargest Indoor Cabin?4.5kW Harvia includedRated 100–210 Cubic Feet?190°F with steamTraditional Mode?192-diode red light panel650nm Spectrum Red Light™?Infrared on four wallsPlus Under The Bench?5-inch touchscreen controlV2 LCD With Bluetooth?Seats three to four71-Inch Interior Width?️10-year sauna warrantyLifetime On The Heaters
The Largest Cabin Finnmark Build Indoors
A Closer Look At The Trinity XL
Traditional Heat
A 4.5kW Harvia Comes With It
The rock heater is not an option box on this page. Finnmark supply the Harvia KIP45B with the cabin: 4.5kW, 240V, single phase, 18.8 nominal amps, 40 lbs, and rated by Harvia for rooms of 100 to 210 adjusted cubic feet. The FD-5’s 130 cubic feet lands comfortably inside that. A single box of Harvia AC3000 stones, sized 0 to 10cm, weighs 44 lbs and ships alongside.
- Harvia KIP45B included with the sauna
- 4.5kW, 240V, single phase, 18.8 nominal amps
- Rated for rooms of 100 to 210 adjusted cubic feet
- 44 lbs of Harvia AC3000 stones, 0 to 10cm
- 190°F maximum in traditional mode
Heater Included4.5kWInterior
One Hundred And Thirty Cubic Feet
Seen from above, the Trinity XL is 71 inches of interior width by 57.5 of depth, with 75.5 inches of headroom over it. That is 44 more cubic feet than the two-person FD-4 and 18.7 more than the FD-3, which is the largest infrared-only cabin in the range. Finnmark rate the room for three to four bathers, and the overhead shot shows the bench and the Harvia in the same frame.
- Interior 71″ W × 57.5″ D × 75.5″ H
- 130 cubic feet of room volume
- Finnmark rate it for three to four bathers
- Largest indoor cabin in the FD line
130 Cu Ft71″ Interior WidthInfrared & Control
Panels On Four Walls, One Touchscreen
Open the front and the whole system is visible at once. Four Spectrum Plus dual wave panels are set into the back wall, two more sit under the bench, two are fitted to each side wall and one goes on the front wall. The Harvia stands separately, and the V2 LCD Controller — a 5-inch touchscreen with Bluetooth — runs the cabin.
- Four Spectrum Plus panels on the back wall
- Two under the bench, two on each side wall, one on the front wall
- V2 LCD Controller, 5-inch touchscreen with Bluetooth
Far + Mid InfraredBluetooth ControlLight
Red Light Therapy And Chromotherapy
The FD-5 carries the same Spectrum Red Light™ Therapy panel as the FD-4: 192 medical grade diodes at 650nm. Chromotherapy lighting is fitted with it, and Finnmark’s gallery runs the cabin through red, blue, green and yellow. Both are driven from the V2 LCD touchscreen.
- 192-diode medical grade LED panel at 650nm
- Chromotherapy lighting included
- Red, blue, green and yellow shown in the gallery
Spectrum Red Light™Chromotherapy
The Finnmark Indoor Lineup
The Top Of The Indoor Range
Finnmark’s five indoor cabins run from one bather to four, and split into three infrared-only models and two Trinity hybrids. The FD-5 is the largest of the five by every measure that counts — 130 cubic feet, 71 inches of interior width, a 4.5kW Harvia included — and the only one running 240V on both the infrared side and the rock heater.
FD-1 — 1 PersonThe smallest cabin in the line, 38 inches square, and it runs off a standard household outlet.Seats 1 bather38 × 38 × 78 in exterior32 × 34 × 70 in interior120V 15A, NEMA 5-15PShop the FD-1FD-2 — 2 PersonFinnmark’s best seller, and the only model in the line with a published heat-up test.Seats 2 bathers48 × 44 × 78 in exterior43 × 40 × 70 in interior54 minutes to 170°FShop the FD-2FD-3 — 3–4 PersonThe size step in the infrared cabins: 67 inches of interior width, on a 240V circuit.Seats 3–4 bathers72 × 46 × 78 in exterior67 × 41 × 70 in interior240V 15A, NEMA 6-15PShop the FD-3FD-4 Trinity — 2 PersonThe way into rocks and steam. A Harvia Vega Compact 1900 ships with the sauna.Seats 2 bathers48 × 48 × 83 in exterior44.25 × 45.5 × 75.5 in interior1.9kW Harvia includedShop the FD-4You’re HereFD-5 Trinity XL — 4 PersonThe largest indoor cabin at 130 cubic feet, with a 4.5kW Harvia included.Seats 4 bathers75 × 64 × 83 in exterior71 × 57.5 × 75.5 in interior4.5kW Harvia includedCurrently viewing
Questions
Frequently Asked Questions
Yes. The Harvia KIP45B comes with the sauna — 4.5kW, 240V, single phase, 18.8 nominal amps, 40 lbs, rated by Harvia for rooms of 100 to 210 adjusted cubic feet. One box of Harvia AC3000 stones, 0 to 10cm and weighing 44 lbs, ships with it.240V throughout, and a licensed electrician is required. Both the infrared side and the Harvia KIP45B run on 240 volts; Finnmark’s stated requirement for the heater is a 240v 20a supply installed by an electrician. Have the circuits confirmed and scheduled before the sauna is delivered. Exact figures should be confirmed by your electrician against the Harvia’s own documentation.Finnmark rate the cabin for three to four bathers. The interior measures 71″ W × 57.5″ D × 75.5″ H and holds 130 cubic feet, the largest indoor volume in the FD line.190°F on traditional, 170°F on infrared. The traditional mode is the one where you pour water over the stones on the Harvia.Size, heater and electrical. The FD-5 holds 130 cubic feet against the FD-4’s 86, is rated for three to four bathers against two, and carries a 4.5kW Harvia KIP45B where the FD-4 has the 1.9kW Vega Compact 1900. The FD-4 runs on 120V across two circuits; the FD-5 is 240V throughout. Red light therapy, chromotherapy and the V2 LCD controller are common to both.Finnmark’s LED panel for the Trinity cabins: 192 medical grade diodes at 650nm, with chromotherapy lighting fitted alongside. Both run from the V2 LCD Controller, a 5-inch touchscreen with Bluetooth. Therapeutic claims for red light on this page belong to Finnmark, who publish their own FDA disclaimer.A Thermo-Aspen exterior over a Western Canadian Cedar interior, as on the rest of the indoor line. Finnmark’s Thermal Plus™ treatment uses heat and steam with no chemicals, and their claim for the treated aspen is that it will not rot, warp, decay or chip. The cedar they describe as naturally antimicrobial, resisting mold, bacteria and fungus.The exterior is 75″ W × 64″ D × 83″ H. Assembled product weight is 575 lbs and shipping weight is 654 lbs including a 48 lb pallet. This is the heaviest and widest of the indoor cabins, so measure the route in before you order.Free curbside delivery via freight to the 48 contiguous states, with free delivery damage insurance included. The freight carrier contacts you 24 to 48 hours ahead to set a day and time Monday through Friday inside a 4-hour window, and will not deliver without speaking to you first. The sauna arrives strapped to a pallet on a 53-foot semi-truck with a single driver, who unloads to your curbside or driveway only. Raise anything unusual about your access — long driveway, low branches, stairs, apartment complex — with us before the sauna ships. When the driver unloads, inspect the boxes and note any scratches, dents, or scuff marks on the delivery receipt. You do not need to open the boxes to do that.Finnmark cover the sauna with a 10-year warranty and the Spectrum Plus™ incoloy infrared heaters with an unconditional lifetime warranty. Finnmark’s own framing for the ten-year term is worth repeating: in the USA the working lifetime of an infrared sauna is considered seven years, so a ten-year term still covers you past that point. They state operational life at 40,000 hours for the Spectrum Plus heaters. Full terms are in the Warranty tab. The sauna is ETL certified and made by Finnmark Designs, based in Wheeling, Illinois.
