HEPA efficiencies of 95% up to 99.9995% (@ 0.3 ?m) Finedust efficiencies of 60% up to 98% ASHRAEHigh quality micro fibreglass mediaLowest initial pressure dropRigid framesFrame height of 68mm up to 292mmHigh quality standard due to Quality Assurance SystemHEPA filter tested by laser particle counting systemHighly economical through high final pressure drop For use in Clean Rooms up to class 1Usable in two flow directions