CleanSpace filter adaptor must be in place when using the CleanSpace large case filters (PAF-0037, PAF-0091, PAF-0050, and PAF-0051); the power unit cover is removed and replaced with the filter adaptor, which the large filters are then clipped in place; important: when selecting a CleanSpace filter please consult a health and safety specialist for advice on the appropriate respiratory equipment and filter use; compatible with all CleanSpace PAPR power units; easy and quickly fitted and removed from the power unit; product weight 113 g; product dimensions 180 x 100 x 80 mm.