The Cleanspace Filter Adaptors are specifically designed to complete the Clean Space EX PAPR System when using the Clean Space large case filters. The Power Unit filter cover is removed and replaced with the Filter Adaptor, which the large filters are then clipped in place. Standards = AS/NZS1716: 2012, IEC 60079-0:2011, IEC 60079-11:2011, EN 60079-0:2012, EN 60079-11:2012Compatible with the Clean Space PAPR power units PAF-0060Materials Plastic casing Electrically Conductive, silicone seal and steel fasteners and stainless steel springsEasy and quickly fitted and removed from the power unit