oven vent sourrounded by stone?

Building a new house. wife saw a standard oven with stone surrounding the exhaust vent. there was no additional info about what type of vent to use and you could not see it. The stone arched over the oven....was really cool. My question is how would a person service the vent once the stone was in place?
Is there a special vent that goes in the attic? or is there a special vent that could be serviced after the stone is put in place?
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