Narvi Flue 15 | Kota Basic Insulated Chimney Kit for 4.7 in Sauna Stove Flues

Built for these

• 

  Narvi NC – The 'Goldilocks of Thermal Mass'
  Narvi's multi-stage-combustion stove in NC 16, 20 and 24, with a 4.7 in connective flue on every model, the outlet this kit's start pipe is built for. It is the flue kit for the NC 16. See the full product and build your package →

• 

  Narvi Kuru Woodburning Sauna Heater From Finland
  The Kuru 14 and Kuru 20. Both carry the same 4.7 in connective flue, with the bottom edge of the connection at either 473 or 19.7 in off the floor, two fixed positions, not a range. See the full product and build your package →

• 

  Narvi Kaamos 20 Woodburning Sauna Heater from Finland
  The Kaamos 132 lb of stone for rooms of 353–706 cu ft. Same 4.7 in connective flue, with the bottom edge 21.9 in off the floor. See the full product and build your package →

• 

  Narvi 30 Wood-Burning Sauna Stove – 24 kW Finnish Heater
  The Narvi 30, the largest Narvi we sell that still uses the 4.7 in connective flue. Its sibling the Narvi 50 is 5.7 in and this start pipe does not suit it. See the full product and build your package →

What’s included

• Narvi Kota Basic Flue 15 chimney kit

Why insulated chimney exists

Narvi’s manuals put a hard number on it: an uninsulated smoke flue must stay 39.4 in from combustible structures, or any greater distance the flue manufacturer specifies. That is why the pipe coming off a stove cannot simply keep going up through a ceiling. The Kota Basic Flue 15 is the insulated modular chimney Narvi builds to solve that.

Narvi’s own words: “Designed with a focus on fire safety and insulation, particular attention is given to the area around the ceiling feedthrough to ensure optimal protection. Its modular design allows for flexible installation that can be adapted to the specific conditions of your building.”

Sizes and materials

The insulated flue is 10 in. in diameter. Below it sits the uninsulated stainless start pipe at 120/4.7/4.8 in. diameter, which Narvi says fits any sauna stove with a 4.7 in smoke output, the figure printed in the technical data of the NC, Kuru, Kaamos 20 and Narvi 30 manuals. The outer casing is zinc-coated steel finished in black heat-resistant paint, and the kit carries CE certification. It weighs 59.5 lb, and Narvi itemises the package contents as one line: Flue Kit.

One detail worth knowing, in Narvi’s words: “the stainless steel pipe can be placed inside an insulated pipe, facilitating easier maintenance and removal of the stove or chimney when necessary.” On a stove that will outlive several sets of stones, that matters.

What Narvi’s manuals require of any chimney on these stoves

• Class T600, whatever the flue is made of, and a minimum recommended draft of 12 Pa.
• A minimum modular flue diameter of 4.7 in, with CE marking on a modular flue.
• The weight of the smoke flue must not bear on the stove, and the stove should be connected to a separate smoke flue.
• The joint between stove and connective flue must be 0.98 in, sealed with fireproof sealing material.

If you are running standard US 6-inch chimney instead of the Narvi insulated system, the stove-side transition is the Narvi Pipe Adapter, built for the same 4.7 in outlet.

Before you order

Measure your run. This is a modular system, and a tall room or a pitched roof takes more of it. Narvi certifies the kit CE; your inspector decides what is acceptable where you are building, so confirm the listing your jurisdiction requires before you buy.

Specifications