the CleanSpace CST A1 P3 P SL R Combined Filter is suitable for protection aagainst airborne particulate (dust, mists and fumes), organic gases or vapours; IMPORTANT: The filters are compatible with latest model CleanSpace ULTRA and CleanSpace PRO PAPR Power Units; when selecting a CleanSpace Filter please consult a Health and Safety specialist for advice on the appropriate respiratory equipment and filter use; used with the revolutionary CleanSpace ULTRA and PRO PAPR: light weight, no hoses or belts; suitable for protection against airborne particulate (dust, mists and fumes organic gases or vapours; materials: Fibreglass particulate media and plastic casing, silicone seal; easy and quickly fitted and removed from the power unit