BOFAP ANTIBACTERIAL FILTERS - disposable Ø int x ext: 28 x 30.5 mm Compatible with: Cosmed BOFAP is a patented antiviral and antibacterial filter made of cardboard for spirometry tests. It combines the convenience of the mouthpiece with the usefulness of the filter. It reduces the risk of cross-contamination between patients and helps maintain the hygiene of the device. A bag of filter material is welded inside the mouthpiece to capture a quantity of particulate matter equal to that captured by BV filters. Laboratory tests have proven that up to 99.99% of particulate matter as small as 0.2 microns is eliminated. BOFAP is fully recyclable and reduces the use of plastic by 99% - reduced risk at lower costs than traditional plastic filters - filtration efficiency comparable to that of plastic filters (over 99.99%) Each filter is individually packaged and labeled in transparent biodegradable film Made in Italy.