This video discusses the limitation of air flow uniformiy in a typical HEPA Fan filter Unit. Technical explanations for the limitations are discussed and a solution involving the use of a diffusion membrane is proposed.

Air flow uniformity in HEPA filters used in fan filter units

[youtube https://www.youtube.com/watch?v=QQ6wksfMgiM&fs=1&hl=en_US]

CEG Membrane Video Demonstration

[youtube https://www.youtube.com/watch?v=5qrwfztBwr4&fs=1&hl=en_US]