Dander is material shed from the body of various animals, similar to dandruff. It may contain scales of dried skin and hair, or feathers. It is a frequent cause of allergy in humans. This article or section does not adequately cite its references or sources. ... This article deals specifically with IgE-mediated hypersensitivity. ...
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Look up Dander in Wiktionary, the free dictionary.
Animal dander is a very small particle (0.3 microns)--much smaller than a grain of pollen(10 microns) or dust mites(30 microns).
Dander is sticky, and can stick to the walls of your home, your furniture and carpeting, clothing, bedding material, allowing it to persist for long periods of time.
are very helpful in removing animal dander from the air, and should probably be placed in the allergic persons bedroom, once again, because that is where they spend 1/3 of their lives.