Labculture Vertical Laminar Flow Cabinet is a ISO Class 3 breath cleanliness within work zone as per ISO 14644.1 . All components are clean room compatible. It protects the filter opposed to incidental damage. Additional removable perforated filter diffuser is easy to clean. Integral filter metal guard on both sides prevents incidental damage to ULPA filter; endless filter gasket is permanently molded on the filter frame and will not deteriorate over time; aerosol challenge test port included. High quality polyester pre filter and U15 ULPA filter with a typical efficiency of 99.9997% at MPPS, 99.9998% at both 0.3 and 0.12 microns provide the best product protection in the world; typical main ULPA filter lifespan is more than three years depending on in utilize conditions and the total number of hours in use per day.