Junction Boxes
Yes, transformers in particular produce heat and can short circuit or start on fire. New electronic transformers are not as prone and the newest codes may have exemptions as such. Connection such a solder or wire nuts are what they don't want t be enclosed as well as they are prone to being loose and creating hot connections.
Things like door bell transformers are typically located in the attic mounted to an octagon box exposed in the open air.
I would check with your local code authorities as they will be the governing authority.
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