Obviously not everyone can have closed cases, with their own
microclimates. If the design, then, admits (or even encourages,
as with fans) interchange of air with the surrounding
environment, I would suggest not only incorporating "molecular
sieve" material into the interior installation, but also
placement of a material such as Purafil's P-800 medium, in thin
section, over the locations of ingress - vent holes, gaps in
casework, etc. While this material is described as "utilizing
the chemisorbent technology of potassium
permanganate-impregnated activated alumina," and is not
represented or rated for particulate entrapment, its structure
suggests that it will also have such a function.
IMHO
Henry Grunder
Conservation/Preservation Coordinator
The Library of Virginia