Hello Elektrix,
Don't need to cover the venting hole of the BME680 in this oven, you only need to refer HSMI document, just follow the normal SMT process.
This is BME HSMI guide: https://www.bosch-sensortec.com/media/boschsensortec/downloads/handling_soldering_mounting_instructions/bst-bme680-hs000.pdf
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