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)



--
Cheers,

John.

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