Pharmatek Filtration Systems Pvt. Ltd supplies Vertical Laminar Down Flow Unit. Pharmatek Filtration Systems Pvt. Ltd is an ISO 9001:2000 recognised company manufacturing a wide range of Laminar Flow Work Station, Air filters, Prefilters and other Clean Air Equipments. The Vertical Laminar Down Flow Unit is suitable for operations involving open vessels of chemicals, solvents or powders or work requiring agent containment or where production process equipment includes bulk horizontal flow pattern across the work surface.