Understanding and Comparing FFP2, KN95, N95, and Other Filtering Respirators Understanding FFP2, KN95, N95, and Other Filtering Respirators Filtering facepiece respirators (FFRs), often called disposable respirators, follow different standards around the world. Each standard s... FFP2 KN95 Mask Comparison Medical Respirator N95 P2 PPE Single Use Respirator DS2