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I had sent this directly to gcornwel.erol.com but it got bounced back. So, even though it fairly specific, maybe other people are interested. K-F Etzold Clean Air: This is something needed in an some industrial environments and usually involves building "Clean Rooms". Clean rooms are common in semiconductor and disk drive manufacture where particles cause defective devices. These rooms are typically specified by class, say class 100, for the degree of filtering used. The finest filters will also remove bacteria. The kind of filters which are used are called "HEPA" filters which stands for High Efficiency Particulate. Typically clean rooms are built with special walls and floors which do not emit particles and which are easy to keep clean. Typically it is also desirable to have a special air flow pattern which requires a perforated floor. This would be questionable for aestestic reasons in a residence. Also the cost is outlandish but clean air can be had. Of course, one can always scale down to say class 1000 or lower but you have to decide how much is enough (cost and aesthetic considerations). Any questions ... contact me. K-F Etzold [log in to unmask]