Recent Improvements in the 200 CFM HEPA Filter

Abstract : Data from recent tests on filters having Lydall 3282, 4350, and 4450 media are shown and compared. Results for the 3282 media show the promise of additional dust capacity increases. In addition to changes in the media type and pleat geometry, electrical enhancement may dramatically increase filter efficiency and dust capacity without raising the pressure drop. A new project to investigate electrical enhancement of the filters is described and includes further refinements to filter test stand. To increase filter reliability and decrease cost, other changes are being proposed, including a corrosion-resistant liner material and a new short-term packaging design for filters used in Navy applications.