Dear Listers,

I’m looking for advice on exhibit case construction.  We have recently designed and built new cases with removable plexiglass tops of varying lengths and heights.  While the seal created by these cases is not airtight, there is potential for build-up of heat, humidity, etc.  Artifacts displayed in the cases are protected from the base by a layer of chemically stable, acid-free material, but the artifacts may still contain acids, contaminants, etc. of their own.  Small holes can easily be drilled into the plexiglass tops, close to where they meet the base, to allow for some airflow.  Can anyone suggest if such holes should be added, and if so, how many, etc?  Any other suggestions pertaining to these cases would be appreciated.

With many thanks,

Lori Tomlinson
Division Manager
Charlotte County Historical Center
Charlotte Harbor, Florida
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