Ventisol manufactures natural smoke and heat exhaust ventilators, domes and lanterns at Kristinehamn, was established in 1988 and sits on the Swedish standards committee for smoke ventilation. Its declaration of performance for the VBP ventilator names the notified body explicitly — VTT Expert Services, identification number 0809 — which carried out type testing under system 1 and issued certificate 0809-CPR-1122 under SS-EN 12101-2:2003, with declared reliability RE 125, activation within sixty seconds and aerodynamic free areas from 0.72 to 2.07 square metres across five sizes; twelve further declarations cover its other ranges. The company has been owned since 2010 by a Finnish group, but Ventisol is the named manufacturer of record on its own declarations, with Swedish production and a Swedish address.