Irmark Polska has traded since 1989 as a wholly Polish-owned ventilation manufacturer and installer, with a Warsaw head office and a production plant at Grabówiec near Pułtusk. Its FDI large-format single-zone smoke-extraction ducts and fittings are covered by Krajowa Ocena Techniczna ITB-KOT-2020/1397, listed in ITB’s published register against the company at ul. Borecka 4B. Beyond manufacture it installs ventilation, air conditioning and smoke-extraction systems. Note that the firm’s own website does not restate the assessment number — it comes from the ITB register rather than from the company.