Kalthoff Luftfilter und Filtermedien GmbH, based in Selm, develops, manufactures and sells air filters for general room air technology. Its product range includes filters for building, cleanroom and process air technology as well as for decentralized and mobile units. The owner-managed, internationally significant medium-sized company has established itself over several decades as a leading supplier of high-performance filter products and services and generates around one quarter of its sales from foreign customers. Research and development comprise a team of qualified engineers, a filter testing laboratory according to DIN ISO 16890, a filter media laboratory and participation in national and international standardization committees.
die Entwicklung, die Fertigung und der Vertrieb von Luftfiltern für die allgemeine Raumlufttechnik.
Converted using the official Destatis and Eurostat correspondence tables; ISIC Rev. 4 is the United Nations' international industry classification.
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Source: German Commercial Register (Handelsregister) Dortmund Local Court, HRB 17540 (as of 31 October 2026)
| Name | Type | City |
|---|---|---|
| Henrik Badt | Geschäftsführer(in) | Dortmund |
| Holger Bornemann | Geschäftsführer(in) | Selm |
Source: German Commercial Register (Handelsregister) Dortmund Local Court, HRB 17540 (as of 31 October 2026)
| Date | Contract | Value |
|---|---|---|
| 3.6.2025 | Supplier · Universität Duisburg-Essen | — |
| Year | Revenue | Profit | Balance | Employees |
|---|---|---|---|---|
| 2024 | Rohergebnis€21.5M2 | €1,747,515 | €24,027,916 | — |
| 2023 | €30,379,778 | €2,012,347 | €23,177,126 | — |
| 2022 | €29,074,175 | €2,212,115 | €22,478,756 | — |
| 2021 | Rohergebnis€17.6M2 | €1,178,450 | €20,102,648 | — |
| 2020 | Rohergebnis€16.7M2 | €794,538 | €18,798,146 | — |
| 2019 | Rohergebnis€16.9M2 | €981,624 | €14,796,629 | — |
| 2018 | Rohergebnis€15.9M2 | €928,888 | €13,316,093 | — |
| 2017 | Rohergebnis€15.7M2 | €1,249,160 | €12,387,369 | — |
| 2016 | Rohergebnis€14.2M2 | €853,670 | €11,455,404 | — |
| 2015 | Rohergebnis€13.4M2 | €593,025 | €9,856,254 | — |
1 Small companies are not required to publish a profit-and-loss statement (§ 326 (1) HGB). The figure shown is the statutory ceiling under § 267 HGB where the balance-sheet total makes it binding — a company may exceed at most one of the three size criteria.
2 Rohergebnis nach § 276 HGB: Umsatzerlöse abzüglich Materialaufwand bzw. Herstellungskosten. Kleine und mittelgroße Kapitalgesellschaften dürfen diese Posten zusammenfassen; die Umsatzerlöse selbst sind dann nicht veröffentlicht und liegen über dem Rohergebnis.
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Source: German Commercial Register (Handelsregister) Dortmund Local Court, HRB 17540 (as of 31 October 2026)
Franz Ziel GmbH
Billerbeck · Herstellung von allen anderen Maschinen für sonstige bestimmte Wirtschaftszweige a. n. g.
Eisenmann GmbH
Böblingen · Herstellung von kälte- und lufttechnischen Erzeugnissen, nicht für den Haushalt
AHT Cooling Systems Germany GmbH
Katzenelnbogen · Herstellung von kälte- und lufttechnischen Erzeugnissen, nicht für den Haushalt
| Cost type | Amount | Share |
|---|---|---|
| Personnel Costs | €12,712,294 | 94.1% |
| Depreciation | €708,421 | 5.2% |
| Interest & Similar | €88,301 | 0.7% |
