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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint745,629 companies indexed · Last updated: today
DirectoryConstruction & ArchitectureSpecialized Construction ActivitiesDerendingenFornax AG
Fornax AG Logo
Verified· 3 sourcesTrust Score
Summary

About the company

Fornax AG provides services in combustion, chimney and chute technologies, offering planning, supply and installation of fireplaces, stoves, pellet and storage heaters. Its portfolio also includes exhaust and chimney systems, chimney covers and laundry/refuse chute installations, using VKF‑approved products and technical consultation.

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Products & services

Industry:Specialized Construction Activities
✓ Offered6
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Fornax AG

Heating system technology
Heating appliances for wood and gas, including fireplaces, stove and tiled stoves, cast-iron stoves, storage stoves, pellet stoves and water-connected units; incl. planning and final assembly.
Chimney technology
Flue systems made of ceramic/shamotte, stainless steel and plastic; for new installations and renovations, including delivery and installation, also for private, industrial and large-scale systems.
Chute systems
Laundry and waste chutes for single-family houses as well as for industry and commercial premises; consulting, development, planning and installation for efficient transport of materials and waste.
Chimney covers
Chimney covers made of concrete, chrome steel and copper, available on request as made-to-measure products.
Soot doors
Soot doors made of galvanized sheet steel, black, for subsequent masonry, also available gas-tight.
EI90 service shafts
Service shafts made of lightweight concrete or vermiculite with fire protection approval for fire resistance class EI90.
Trust & reputation

ranQ Trust Score of Fornax AG: 4.1 out of 5.0

Trust Score4.1/ 5.0

High

x

Data basis 96% · As of October 2026

Fornax AG scores 64.5 out of 100 points in the Reputation area of the ranQ Trust Score. This area carries 42% of the weighting.
x
CriterionValueWeight
  • Review quality: The average rating across all connected sources, smoothed against the industry mean. So 5.0 stars from three reviews do not outrank 4.7 from three hundred.47.624%
  • Review volume: The number of reviews across all sources. The scale is logarithmic: the first reviews count the most, and the maximum is reached at 50 reviews.80.810%
  • Review recency: The age of the most recent review. Two-year-old reviews deliberately sit in the middle, because that is normal for Swiss SMEs. Only after three years without a new voice does the value drop markedly.95.08%
Fornax AG scores 85.5 out of 100 points in the Substance area of the ranQ Trust Score. This area carries 28% of the weighting.
x
CriterionValueWeight
  • Establishment: Years since founding or brand launch, logarithmic. The maximum is reached at 15 years.100.012%
  • Company size: The headcount band, researched by ranQ or stated by the company. It is scored in steps rather than by head count, because the data only provides bands.55.07%
Fornax AG scores 85.0 out of 100 points in the Identity area of the ranQ Trust Score. This area carries 22% of the weighting.
x
CriterionValueWeight
  • Verification: Official register entry (commercial register with UID or professional-body record, 55 points), confirmed domain (20 points) and confirmed ranQ profile (up to 25 points, depending on completeness).85.022%
Fornax AG scores 60.0 out of 100 points in the Visibility area of the ranQ Trust Score. This area carries 8% of the weighting.
x
CriterionValueWeight
  • Website authority: Ahrefs' Domain Rating measures, on a scale of 0 to 100, how strongly a website is linked from other websites. For Swiss SMEs the range up to 40 is typical; the maximum is reached at 35.60.04%
  • Media authority: No data point — the criterion is taken out of the weighting and does not lower the score.—4%
Qualifications+0.00

Fornax AG reaches a ranQ Trust Score of 4.1 out of 5.0 — rated «High». The rating draws, among other things, on 3.8 out of 5 stars from 23 customer reviews. The data basis is 96%, so the score is backed by part of the criteria. As of October 2026.

The Trust Score cannot be bought and is calculated from publicly verifiable data.

Reviews

Aggregated rating

Aggregated rating
3.8
of 5

Aggregated from 23 reviews across all connected sources

Sources
GGoogle3.823
★TrustpilotSoon
PProvenExpertSoon

Further sources are added continuously and factored into the ranQ Rating.

Knowledge

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Comparisons

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Location

Fabrikstrasse 1
4552 Derendingen
Opening hours
Mon
07:30 - 12:00, 13:30 - 17:30
Tue
07:30 - 12:00, 13:30 - 17:30
Wed
07:30 - 12:00, 13:30 - 17:30
Thu
07:30 - 12:00, 13:30 - 17:30
Fri
07:30 - 12:00, 13:30 - 17:30
Sat
09:00 - 13:00
Sun
Closed

At a glance

Legal form
Corporation
UID
CHE-106.620.029
Founded
1995 · 31 years
Last commercial register change
August 17, 2023
Employees
1 to 10
Legal form: Graded by liability and disclosure. The weight is kept small: a sole proprietorship is not a dubious company, it is just liable differently.
100.0
6%
  • Branch offices: Branch offices linked in the commercial register. Having none is normal and costs no points.70.03%
    • Full methodology

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