Désenfum’Est designs, installs and maintains natural and mechanical smoke-extraction systems, air-supply ventilation and associated SSI equipment across Alsace and the Grand Est. The firm holds QUALIBAT 5321 for natural smoke extraction and QUALIBAT 5322 for mechanical, together with APSAD service certification I17 and F17 from CNPP Cert. under certificate 031/08/I17.F17, covering the installation and maintenance of smoke-control systems to rule R17.