I understand the arguments for it, the temperatures etc, however (bad news part)...
have never seen an Auditor accept shorts in a production area, regardless of height of product. temperature or risk analysis.
I have seen Auditors accept shorts in non-production area that did not have exposed product.
Will say that I have seen Auditors that see folks in shorts in production not only write up the shorts but also ventilation issues as shorts are an immediate red flag to other issues.
In our planned southern building we have a mostly metal building and will have 3 cargo doors that will be left open for venting - all have pull down fine mesh (not even "no see" nor bird mites can get thru) gel bottom and siders on them for a good seal, but they will allow ample air flow.
You may want to take a look into linen slacks/pants loose weave, very comfortable, allowing good air flow and just fine with auditors too.
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