Finnmark FD-3 Full Spectrum 4-Person Infrared Sauna

The Finnmark FD-3 is the family-size Full Spectrum infrared sauna in Finnmark Designs' premium line. 72" wide × 46" deep with bench seating for 3 to 4 adults, the FD-3 pairs Spectrum Plus full-spectrum heating with the same lifetime-warranty premium build as the FD-2.

Spectrum Plus Full-Spectrum Heaters — 3.1 kW

The FD-3 uses Finnmark's Spectrum Plus incoloy heaters across the back, side, and ceiling — delivering near-, mid-, and far-infrared wavelengths from a single cabin. Heater rating: 3.1 kW (3,150 W). Maximum cabin temperature: 170°F, higher than typical infrared cabins.

Premium Wood Construction

Canadian Aspen exterior + Western Red Cedar interior — same construction as the FD-2 but in 4-person scale. Bronze tinted 8mm tempered glass door with side panels. Antimicrobial cedar interior naturally resists mold and bacteria.

Lifetime Heater Warranty + 10-Year Craftsmanship

The FD-3 carries Finnmark's strongest warranty package — lifetime warranty on Spectrum Plus heaters and 10-year coverage on cabinet craftsmanship + electrical components. The FD-3 is built to be a multi-decade home wellness investment.

Dedicated 240V/15A Circuit Required

Higher heater rating means the FD-3 needs a 240V/15A dedicated circuit — an electrician is recommended for safe installation. Ships via LTL freight with free US 48 curbside delivery.

What's Included

• Capacity: 3 to 4 person
• Heater: Spectrum Plus full-spectrum infrared (incoloy), 3.1 kW
• Max Temperature: 170°F
• Exterior Wood: Canadian Aspen
• Interior Wood: Western Red Cedar (antimicrobial)
• Glass: 8mm tempered (bronze tinted)
• Exterior Dimensions: 72"W × 46"D × 78"H
• Room Volume: 111.3 cubic feet
• Electrical: 240V / 15A single phase
• Warranty: Lifetime on Spectrum+ heaters; 10-year craftsmanship + electrical
• Indoor residential use only