Hi Roger, > The Humidifier Treatment suppresses the growth of mold and mildew. My > understanding is that these microorganisms are associated with > allergies, not asthma. I hope this helps. Allergies result in asthma attacks. When I lived in Houston, mold capitol of the world, every other breath I took was through my inhaler. The same was true for one of my roommates. ;-) Having said that, I doubt there is enough air exchange in a closed system to be problematic, even if some mold grows in the system. If she has a grand, she'll want a bottom cover. She may also need a volunteer to do any cleaning/changing for her. Peace, Sarah www.graphic-fusion.com
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