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The original was posted on /r/askscience by /u/awing1 on 2023-08-04 22:05:11+00:00.

I feel ashamed that I don’t know the answer to this as I studied radio electronics and EMF, however its been a whil. Does a completely enclosed metal box with solid walls act as a Faraday cage? Whenever I see anything that its intended purpose is blocking EMF, it’s usually an actual cage or a metal mesh. Is this for purpose or just for cost?