The ndd Medical EasyOne Filter FT (#2091-422) is specially designed for use with the FlowTube mouthpiece only. It helps ensure highly accurate test measurements and keeps the ambient environment clean while the ndd mouthpiece protects from cross-contamination.Featuresndd Medical EasyOne Filter FT Features Helps keep the environment clean for both patients and healthcare professionals. Meets the 2019 ATS/ERS spirometry standards for accuracy. Provides an optimal fit which leads to minimal resistance and high-quality results. Enjoy optimal filter efficiency and accuracy. Utilizes unique and innovative technology (patent pending). Specificationsndd Medical EasyOne Filter FT SpecificationsFilter Dead Space: ≤ 60 mL. Resistance: ≤ .5 cm H2O. Waveform Test: Passes ISO 26782 waveform testing required by ATS/ERS (2019). Filter Properties (Tested at Nelson Labs US): Bacterial Filtration Efficiency (BFE): 99.99%. Viral Filtration Efficiency (VFE): 99.99%. Weight: ≤ 28 g. Dimensions: 8 cm x 8 cm. Filter Pad Material: Electrostatic fibres.Filter Materials and Additives Compliant With: REACH regulations.Filter Types Compatible With: EOA firmware V1.18.x or higher. EOC software V3.9.3.x or higher.Literaturendd Medical EasyOne Filter FT Literaturendd Medical EasyOne Filter EU Declaration of Conformityndd Medical EasyOne Filter Brochurendd Medical EasyOne Filter Factsheet