Surgical Line TYPE IIR Masks Omnia. Spiritus Plus® face masks feature three-layer non-woven, fluid-resistant fabric. Layers are sealed on one side through an ultrasound procedure preventing bacteria migration. Furthermore, the hypoallergenic and glass-fibre-free non-woven fabric (NWF) ensures a high bacterial filtration efficiency (BFE) and a very low breathing resistance (Δ P). The adaptable nose bar in aluminium follows the whole length of the face mask. Spiritus Plus surgical face masks comply with the EN 14683:2005 European standard.