On 03 Apr 2006, John wrote:

Will wrote:

Is HEPA a registered trademark?

It may have become one, although it started life simply as an
acronym.

What technology does a HEPA filter make use of? Is it nothing
much more impressive than a very fine aperture standard filter?

It ii a fiberous mat - when talking about stanad alone filters
ifusually with a large surface area enclosed in a container of
some sort

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?

The HEPA filter is usually the last filter in a sequence and hce
is fed mostly clean air. It will trap the smallest and most
penetrating particles including the carbon dust generated by the
motor itself.

Can a HEPA filter be washed or otherwise cleaned so that it can
be reused?

Not IME.

Or is the life of a HEPA filter so long that this is not a
consideration.

They last a reasonable time if you avoid things like sucking up
plaster dust (or any other super fine clogging material)



Can I buy generic HEPA filtration material in the form of a sheet?