Product Specification Product Name: HMF-YG001 Disposable breathing filter(lung function) Caliber:Machine side: M30 interface Patient side:F22/M15 interface (in line withYY104101-2015/53651-2004 Particle size of the fiter:0.5um of the particesmicroorganisms and viruses Filtration eficiency:Non-woven and needled cotton99.9%