"leslie" wrote in message
...
My roommate suffers from allergies and has pillow and mattress casings
for dust mites, and a HEPA filter that can even deal with cigarette smoke:


http://www.allergyconsumerreview.com...-purifier.html
IQAir Hepa Air Purifier with Hepa Filter Review

"The IQair hepa air filter is a new entrant into the market place from
Switzerland. It is a testament to precision Swiss engineering. The
company behind it is in the hospital clean room business..."

Dyson vacuum cleaners have them.

http://www.dyson.co.uk/

Paul