Can someone who understands the physics of HEPA filtration help me understand HEPA a bit better please. Google is not much of a friend for this info!
Is HEPA a registered trademark?
What technology does a HEPA filter make use of? Is it nothing much more impressive than a very fine aperture standard filter?
is the HEPA filter on a vacuum cleaner likely to need replacing more often than non-HEPA on account of the greater dust it traps?
Can a HEPA filter be washed or otherwise cleaned so that it can be reused? Or is the life of a HEPA filter so long that this is not a consideration.
Thank you for any info.