DUPLA is a negative pressure full face mask with threaded connector to EN148-1. DUPLA integrates a panoramic visor and can be used both with screw filters to EN 148-1 and special cartridges of the Spasciani 2000 series. The face blank is normally made of TPE but it is also available in EPDM or SILICONE equipped with scratch and solvent resistant polycarbonate.