... filter, with kinds of outer housing, pleat HEPA filter, as well as sheet filter 2.99% efficiency at0.5um 3.Pass SGS plastic frame air hepa filter ... keeping out of dust.Description:1. plastic frame air hepa filter is of Physical intercept filtering and make the filtration more ... efficiency @0.5um.2.Washable and non-washable3.8MM-80MM pleat height4.Material :PET,X-CROSS,NANO material, glassfibre, PTFE, ...