Conditions of use The Vertical Laminar Air Flow (VLAF) is used for the protection of the filling / packaging operations of products that are sensitive to contamination. Working principle : A class ISO 5 (NF, EN, ISO 14644-1) laminar air flow is blown vertically from the plenum towards the ground, and is guided within the area to be protected via a system of either flexible PVC curtains or rigid polycarbonate panels. This air flow maintains the area to be protected under a greater pressure than the surrounding room, thus avoiding any cross contamination. Construction : The VLAF is composed of two plenums: a blowing plenum, equipped with the HEPA filters, perfectly airtight to the EMERY test ; and a ventilation plenum, located beside the blowing plenum, which holds the ventilation fan, and blows the air into the blowing plenum. The equipment can be fixed on the ceiling or mounted on simple feet or feet with casters.